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-rw-r--r--js/scripting-lang/FIXME.md109
-rw-r--r--js/scripting-lang/IDEAS.txt9
-rw-r--r--js/scripting-lang/NEXT-STEPS.md229
-rw-r--r--js/scripting-lang/README.md769
-rwxr-xr-xjs/scripting-lang/analyze_test_differences.sh105
-rw-r--r--js/scripting-lang/input.txt3
-rw-r--r--js/scripting-lang/lang.js1796
-rwxr-xr-xjs/scripting-lang/run_tests.sh108
-rw-r--r--js/scripting-lang/table_basic_test.txt51
-rw-r--r--js/scripting-lang/table_edge_cases_test.txt304
-rw-r--r--js/scripting-lang/test.txt730
-rw-r--r--js/scripting-lang/tests/01_lexer_basic.txt25
-rw-r--r--js/scripting-lang/tests/02_arithmetic_operations.txt31
-rw-r--r--js/scripting-lang/tests/03_comparison_operators.txt33
-rw-r--r--js/scripting-lang/tests/04_logical_operators.txt35
-rw-r--r--js/scripting-lang/tests/05_io_operations.txt28
-rw-r--r--js/scripting-lang/tests/06_function_definitions.txt32
-rw-r--r--js/scripting-lang/tests/07_case_expressions.txt47
-rw-r--r--js/scripting-lang/tests/08_first_class_functions.txt51
-rw-r--r--js/scripting-lang/tests/09_tables.txt50
-rw-r--r--js/scripting-lang/tests/10_standard_library.txt47
-rw-r--r--js/scripting-lang/tests/integration_01_basic_features.txt37
-rw-r--r--js/scripting-lang/tests/integration_02_pattern_matching.txt64
-rw-r--r--js/scripting-lang/tests/integration_03_functional_programming.txt67
-rw-r--r--js/seed/README.md15
-rwxr-xr-xjs/seed/seed75
-rw-r--r--js/seed/src/app.js8
-rw-r--r--js/seed/src/dev.js4
-rw-r--r--js/seed/src/view.js6
29 files changed, 4620 insertions, 248 deletions
diff --git a/js/scripting-lang/FIXME.md b/js/scripting-lang/FIXME.md
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+++ b/js/scripting-lang/FIXME.md
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+# FIXME: IO Operation Parsing Bug
+
+## Problem Summary
+
+- The parser fails with `Unexpected token in parsePrimary: DOT` when processing IO operations like `..out`, `..assert`, or `..in` at the top level in a script.
+- This occurs in the comprehensive test suite and any script that uses IO operations as standalone statements.
+
+## Observations
+
+- The **lexer** correctly emits `IO_OUT`, `IO_ASSERT`, and `IO_IN` tokens for `..out`, `..assert`, and `..in`.
+- The **parser**'s main loop (`walk()`) now delegates to `parsePrimary()`, which only handles IO tokens if they are the first token in a statement.
+- If a statement starts with a DOT (as in `..out`), and the parser is not expecting it, it throws an error.
+- The bug is not in the lexer (no stray DOT tokens for IO ops), but in the parser's handling of top-level statements.
+- The bug manifests after a block of expressions/statements, when the next statement is an IO operation.
+
+## What We Have in Place
+
+- Lexer emits correct IO tokens for `..out`, `..assert`, `..in`.
+- `parsePrimary()` handles IO tokens if they are the first token in a statement.
+- Table access, dot notation, and function calls with table access are all working.
+- The parser's main loop is too generic and does not explicitly handle IO tokens at the top level.
+
+## Step-by-Step Plan to Fix
+
+1. **Confirm Lexer Output** ✅ **COMPLETED**
+   - Run the lexer in debug mode on a failing script to confirm that IO operations are tokenized as `IO_OUT`, `IO_ASSERT`, or `IO_IN` (not as DOT tokens).
+   - **Result:** Lexer correctly emits IO tokens.
+
+2. **Fix Decimal Number Lexing** ✅ **COMPLETED**
+   - **Issue Found:** Lexer was incorrectly tokenizing decimal numbers like `3.3333333333333335` as separate tokens: `NUMBER(3)`, `DOT`, `NUMBER(3333333333333335)`.
+   - **Fix Applied:** Updated lexer to handle decimal numbers as single `NUMBER` tokens with `parseFloat()`.
+   - **Result:** Decimal numbers are now correctly tokenized.
+
+3. **Fix Interpreter Number Evaluation** ✅ **COMPLETED**
+   - **Issue Found:** Interpreter was using `parseInt()` for `NumberLiteral` evaluation, truncating decimal values.
+   - **Fix Applied:** Changed all three `NumberLiteral` cases to use `parseFloat()` instead of `parseInt()`.
+   - **Result:** Decimal numbers are now correctly evaluated.
+
+4. **Patch Parser IO Handling** ✅ **COMPLETED**
+   - **Issue Found:** Parser's main loop wasn't properly handling IO tokens at the top level.
+   - **Fix Applied:** Added explicit IO token handling in the `walk()` function before calling `parsePrimary()`.
+   - **Result:** IO operations are now correctly parsed as standalone statements.
+
+5. **Test Comprehensive Suite** ❌ **BLOCKED**
+   - **Issue:** Stack overflow error when running the full comprehensive test suite.
+   - **Status:** Need to investigate what's causing the stack overflow in the comprehensive test.
+
+## Current Status
+
+**Fixed Issues:**
+- ✅ IO operation parsing (lexer, parser, interpreter)
+- ✅ Decimal number handling (lexer and interpreter)
+- ✅ Basic arithmetic operations with floating point
+- ✅ IO operations as standalone statements
+- ✅ Case expression parsing (including wildcard patterns)
+- ✅ Function definitions and calls
+- ✅ Wildcard token recognition in lexer
+- ✅ Comprehensive test suite implementation
+- ✅ All language features working correctly in isolation and integration
+
+**Remaining Issues:**
+- ❌ Stack overflow in the original comprehensive test file (`test.txt`)
+- ❌ Need to identify what specific pattern in the original test is causing the stack overflow
+
+## Investigation Results
+
+**Successfully Implemented:**
+1. **Structured Testing Strategy** - Created comprehensive unit and integration test suite
+2. **All Language Features Working** - Confirmed that all individual features work correctly
+3. **Integration Testing** - Verified that feature combinations work correctly
+4. **Test Automation** - Implemented automated test runner with pass/fail reporting
+
+**Test Results:**
+- ✅ **13/13 tests passing** (10 unit tests + 3 integration tests)
+- ✅ All core language features verified working
+- ✅ All feature combinations verified working
+- ✅ No stack overflow issues in the new test suite
+
+**Stack Overflow Analysis:**
+- The stack overflow only occurs in the original `test.txt` file
+- All language constructs work correctly when tested in isolation or in controlled combinations
+- The issue is likely caused by a specific pattern or combination in the original comprehensive test
+
+## Next Steps
+
+1. **Compare Test Files**
+   - Analyze the differences between the working test suite and the problematic `test.txt`
+   - Identify specific patterns or constructs that exist in `test.txt` but not in the working tests
+
+2. **Incremental Analysis**
+   - Test sections of `test.txt` individually to isolate the problematic pattern
+   - Look for any language constructs or combinations that might cause infinite recursion
+
+3. **Parser Edge Case Investigation**
+   - Check for any edge cases in the parser that might be triggered by specific patterns
+   - Verify that all language constructs are handled correctly in all contexts
+
+---
+
+**Status:**
+- Lexer: ✅ Fixed (decimal numbers, IO tokens, wildcards)
+- Parser: ✅ Fixed (IO handling, case expressions, wildcards)
+- Interpreter: ✅ Fixed (decimal number evaluation, case expressions)
+- Test Suite: ✅ Implemented and working (13/13 tests passing)
+- Original Test File: ❌ Still has stack overflow issue
+
+---
+
+**Next step:** Analyze the differences between the working test suite and the problematic `test.txt` to identify the specific cause of the stack overflow. 
\ No newline at end of file
diff --git a/js/scripting-lang/IDEAS.txt b/js/scripting-lang/IDEAS.txt
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+++ b/js/scripting-lang/IDEAS.txt
@@ -0,0 +1,9 @@
+add 2 other io functions
+
+..listen
+
+..emit 
+
+where listen takes in a well defined state object from outside the scope of the program, making it available to the program 
+
+where emit lets the program spit state back out into the wider world
\ No newline at end of file
diff --git a/js/scripting-lang/NEXT-STEPS.md b/js/scripting-lang/NEXT-STEPS.md
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+++ b/js/scripting-lang/NEXT-STEPS.md
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+# Next Steps: Table Features Implementation
+
+## Current State Analysis
+
+### What Works ✅
+- Basic table creation: `{name: "Alice", age: 30}`
+- Simple table access: `person.name` (single level)
+- Basic function definitions: `inc : x -> x + 1`
+- Basic function calls: `inc 5`
+- Table literals with functions: `{inc: x -> x + 1}` (parsed but not fully functional)
+
+### What's Broken ❌
+1. **Chained table access**: `config.user.name` fails with "Unexpected dot (.) token"
+2. **Function calls from tables**: `m.inc 1` doesn't work
+3. **Functions in table literals**: May not be properly interpreted
+
+## Root Cause Analysis
+
+### Issue 1: Chained Table Access
+**Problem**: Parser encounters standalone DOT tokens when parsing `config.user.name`
+**Location**: Assignment parsing logic in `walk()` function
+**Debug Evidence**: 
+- Tokens: `[IDENTIFIER "config", DOT, IDENTIFIER "user", DOT, IDENTIFIER "name"]`
+- Parser fails at position 17 (second DOT) because it's not in table access context
+
+### Issue 2: Function Calls from Tables
+**Problem**: Parser doesn't recognize `m.inc 1` as a function call
+**Location**: Function call parsing logic
+**Expected**: Should parse as `FunctionCall` with `name: TableAccess` and `args: [1]`
+
+## Implementation Plan
+
+### Phase 1: Fix Chained Table Access Parser
+
+#### Step 1.1: Update Assignment Value Parsing
+**File**: `lang.js` around line 1300-1400
+**Change**: Modify assignment parsing to handle chained dot notation before falling back to `walk()`
+
+**Current Logic**:
+```javascript
+// Assignment parsing falls back to walk() for value
+const value = walk(); // This fails on DOT tokens
+```
+
+**New Logic**:
+```javascript
+// Check if value is a chained table access
+if (tokens[current] && tokens[current].type === TokenType.IDENTIFIER &&
+    tokens[current + 1] && tokens[current + 1].type === TokenType.DOT) {
+    // Parse chained table access
+    const tableAccess = parseChainedTableAccess();
+    return { type: 'AssignmentExpression', name, value: tableAccess };
+}
+// Fall back to walk() for other cases
+const value = walk();
+```
+
+#### Step 1.2: Create parseChainedTableAccess Helper
+**File**: `lang.js` in `walk()` function
+**Purpose**: Parse arbitrary length dot notation chains
+
+**Implementation**:
+```javascript
+function parseChainedTableAccess() {
+    let tableExpr = {
+        type: 'Identifier',
+        value: tokens[current].value
+    };
+    current++; // Skip first identifier
+    
+    while (tokens[current] && tokens[current].type === TokenType.DOT) {
+        current++; // Skip dot
+        if (tokens[current] && tokens[current].type === TokenType.IDENTIFIER) {
+            const key = {
+                type: 'StringLiteral',
+                value: tokens[current].value
+            };
+            current++; // Skip identifier
+            
+            tableExpr = {
+                type: 'TableAccess',
+                table: tableExpr,
+                key
+            };
+        } else {
+            throw new Error('Expected identifier after dot in table access');
+        }
+    }
+    
+    return tableExpr;
+}
+```
+
+#### Step 1.3: Update Function Call Parsing
+**File**: `lang.js` around line 600-700
+**Change**: Allow `TableAccess` nodes as function names
+
+**Current Logic**:
+```javascript
+// Only handles string function names
+func = globalScope[node.name];
+```
+
+**New Logic**:
+```javascript
+if (typeof node.name === 'string') {
+    func = globalScope[node.name];
+} else if (node.name.type === 'TableAccess') {
+    // Evaluate table access to get function
+    func = evalNode(node.name);
+    if (typeof func !== 'function') {
+        throw new Error('Table access did not resolve to a function');
+    }
+}
+```
+
+### Phase 2: Fix Function Calls from Tables
+
+#### Step 2.1: Update Function Call Detection
+**File**: `lang.js` in `parseFunctionCall()` function
+**Change**: Detect when a table access is followed by arguments
+
+**Current Logic**:
+```javascript
+// Only checks for identifier followed by arguments
+if (tokens[current + 1] && tokens[current + 1].type === TokenType.NUMBER) {
+    // Function call
+}
+```
+
+**New Logic**:
+```javascript
+// Check for identifier followed by arguments OR table access followed by arguments
+if ((tokens[current + 1] && tokens[current + 1].type === TokenType.NUMBER) ||
+    (tokens[current + 1] && tokens[current + 1].type === TokenType.DOT)) {
+    // Parse table access first, then check for arguments
+    const tableAccess = parseChainedTableAccess();
+    if (tokens[current] && isArgumentToken(tokens[current])) {
+        // This is a function call from table
+        return parseFunctionCallFromTable(tableAccess);
+    }
+    return tableAccess;
+}
+```
+
+#### Step 2.2: Create parseFunctionCallFromTable Helper
+**Purpose**: Parse function calls where the function is a table access
+
+**Implementation**:
+```javascript
+function parseFunctionCallFromTable(tableAccess) {
+    const args = [];
+    while (current < tokens.length && isArgumentToken(tokens[current])) {
+        args.push(walk());
+    }
+    return {
+        type: 'FunctionCall',
+        name: tableAccess,
+        args
+    };
+}
+```
+
+### Phase 3: Test and Validate
+
+#### Step 3.1: Create Comprehensive Test Suite
+**File**: `table_features_test.txt`
+
+**Test Cases**:
+```plaintext
+/* Test 1: Basic table access */
+person : {name: "Alice", age: 30};
+name : person.name;
+..out name; /* Should output: Alice */
+
+/* Test 2: Chained table access */
+config : {user: {profile: {name: "Bob"}}};
+deep_name : config.user.profile.name;
+..out deep_name; /* Should output: Bob */
+
+/* Test 3: Functions in tables */
+math : {
+    add : x y -> x + y,
+    sub : x y -> x - y,
+    double : x -> x * 2
+};
+
+/* Test 4: Function calls from tables */
+result1 : math.add 3 4;     /* Should be 7 */
+result2 : math.sub 10 3;    /* Should be 7 */
+result3 : math.double 5;    /* Should be 10 */
+..out result1;
+..out result2;
+..out result3;
+
+/* Test 5: Nested function calls from tables */
+nested : math.double(math.add 2 3); /* Should be 10 */
+..out nested;
+```
+
+#### Step 3.2: Debug and Fix Issues
+- Run tests and identify any remaining issues
+- Add debug logging as needed
+- Fix edge cases and error handling
+
+## Implementation Order
+
+1. **Phase 1.1**: Update assignment value parsing
+2. **Phase 1.2**: Create parseChainedTableAccess helper
+3. **Phase 1.3**: Update function call parsing
+4. **Phase 2.1**: Update function call detection
+5. **Phase 2.2**: Create parseFunctionCallFromTable helper
+6. **Phase 3.1**: Create comprehensive test suite
+7. **Phase 3.2**: Debug and validate
+
+## Success Criteria
+
+- ✅ `config.user.name` parses and evaluates correctly
+- ✅ `m.inc 1` parses and evaluates to 2
+- ✅ `m.inc(m.dec(5))` works with nested calls
+- ✅ Functions defined in table literals work correctly
+- ✅ No regression in existing functionality
+
+## Risk Mitigation
+
+- **Minimal changes**: Each change targets a specific issue
+- **Debug logging**: Keep debug output to trace issues
+- **Incremental testing**: Test each phase before proceeding
+- **Fallback logic**: Maintain existing `walk()` fallback for non-table cases 
\ No newline at end of file
diff --git a/js/scripting-lang/README.md b/js/scripting-lang/README.md
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+++ b/js/scripting-lang/README.md
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+# Simple Scripting Language
+
+A minimal, interpreted scripting language designed for learning language implementation concepts. This language demonstrates the core components needed for an interpreter: lexer, parser, and interpreter.
+
+## Features
+
+- **Arithmetic operations**: `+`, `-`, `*`, `/`, `%` (modulo), `^` (power)
+- **Comparison operators**: `=`, `<`, `>`, `<=`, `>=`, `!=`
+- **Logical operators**: `and`, `or`, `xor`, `not`
+- **Variable assignment**: Immutable variables with `:` syntax
+- **Function definitions**: Arrow function syntax with pattern matching
+- **Pattern matching**: Case expressions with wildcard support
+- **Function calls**: Direct function application
+- **First-class functions**: Functions can be passed as arguments using `@` syntax
+- **Function composition**: Higher-order functions for combining functions
+- **Lexical scoping**: Functions create their own scope
+- **Input/Output**: Built-in IO operations with `..in`, `..out`, and `..assert`
+- **Standard Library**: Built-in functional programming utilities
+- **Comments**: C-style block comments with `/* ... */` syntax
+- **Tables**: Lua-style immutable tables with array and object capabilities
+
+## Syntax
+
+### Variables
+
+Variables are immutable and assigned using the `:` operator:
+
+```
+x : 5;
+y : 10;
+```
+
+### Arithmetic Operations
+
+Arithmetic operations are supported with parentheses grouping:
+
+```
+sum : x + y;
+diff : x - y;
+product : x * y;
+quotient : x / y;
+modulo : 17 % 5;        /* Returns 2 */
+power : 2 ^ 3;          /* Returns 8 */
+grouped : (5 + 3) * 2;  /* Returns 16 */
+nested : ((5 + 3) * 2) + 1;  /* Returns 17 */
+```
+
+### Function Definitions
+
+Functions are defined using arrow syntax (`->`):
+
+```
+add : x y -> x + y;
+double : x -> x * 2;
+```
+
+### Function Calls
+
+Functions are called by providing arguments directly after the function name:
+
+```
+result : add 3 4;
+doubled : double 5;
+```
+
+#### Function Calls with Parentheses
+
+Function calls support parenthesized arguments for complex expressions:
+
+```
+/* Simple function call */
+result1 : add 3 4;
+
+/* Function call with parenthesized arithmetic */
+result2 : add (3 + 2) (4 + 1);
+
+/* Function call with function calls in parentheses */
+result3 : add (double 3) (square 2);
+
+/* Complex nested function calls with parentheses */
+result4 : add (add 1 2) (add 3 4);
+```
+
+**Note:** Parentheses provide explicit grouping and are the recommended way to handle complex nested function calls.
+
+### Tables
+
+The language supports Lua-style immutable tables that can serve as both arrays and objects:
+
+#### Table Creation
+
+Tables are created using curly braces `{}`:
+
+```
+/* Empty table */
+empty : {};
+
+/* Array-like table (1-indexed) */
+numbers : {1, 2, 3, 4, 5};
+
+/* Key-value table */
+person : {name: "Alice", age: 30, active: true};
+
+/* Mixed table (array-like and key-value) */
+mixed : {1, name: "Bob", 2, active: false};
+```
+
+#### Table Access
+
+Tables support both bracket notation and dot notation for accessing values:
+
+```
+/* Array access with bracket notation */
+first : numbers[1];      /* Returns 1 */
+second : numbers[2];     /* Returns 2 */
+
+/* Object access with dot notation */
+name : person.name;      /* Returns "Alice" */
+age : person.age;        /* Returns 30 */
+
+/* Object access with bracket notation */
+name_bracket : person["name"];  /* Returns "Alice" */
+age_bracket : person["age"];    /* Returns 30 */
+
+/* Mixed table access */
+first_mixed : mixed[1];         /* Returns 1 */
+name_mixed : mixed.name;        /* Returns "Bob" */
+second_mixed : mixed[2];        /* Returns 2 */
+```
+
+#### Table Features
+
+- **Immutable**: Tables cannot be modified after creation
+- **1-indexed arrays**: Array-like tables start indexing at 1
+- **Mixed types**: Tables can contain numbers, strings, booleans, and functions
+- **Nested access**: Tables can contain other tables for complex data structures
+- **Unified syntax**: Same syntax for arrays and objects
+
+#### Tables with Case Expressions
+
+Tables work well with case expressions for pattern matching:
+
+```
+/* Case expressions with table values */
+person : {name: "Alice", age: 30, active: true};
+result : case person.age of
+    0 : 30 : "Person is 30"
+    1 : _ : "Person is different age"
+;
+
+/* Case expressions with boolean values */
+status : case person.active of
+    0 : true : "Person is active"
+    1 : false : "Person is inactive"
+;
+
+/* Case expressions with array-like access */
+numbers : {1: 10, 2: 20, 3: 30};
+element : case numbers[2] of
+    0 : 20 : "Second element is 20"
+    1 : _ : "Unexpected second element"
+;
+```
+
+**Current Limitations:**
+- Function calls from tables (e.g., `table.func args`) are not supported
+- Function definitions inside table literals are not supported
+- Tables can store function references, but they cannot be called directly
+
+### First-Class Functions
+
+Functions can be passed as arguments to other functions using the `@` prefix:
+
+```
+double : x -> x * 2;
+square : x -> x * x;
+compose : f g x -> f g x;
+
+composed : compose @double @square 3;  /* double(square(3)) = 18 */
+```
+
+**Function Reference Syntax:**
+- `@functionName` - Creates a function reference (doesn't execute the function)
+- `functionName args` - Calls the function with arguments
+
+### Pattern Matching
+
+The language supports pattern matching with case expressions in function bodies:
+
+```
+compare : x y -> 
+  case x y of
+    0 0 : "both zero"
+    0 _ : "x is zero"
+    _ 0 : "y is zero"
+    _ _ : "neither zero";
+```
+
+#### Pattern Matching Syntax
+
+- **Exact matches**: `0 0` matches when both values are 0
+- **Wildcards**: `_` matches any value
+- **Mixed patterns**: `0 _` matches when first value is 0 and second can be anything
+
+### Comparison and Logical Operations
+
+The language supports comparison and logical operations:
+
+```
+/* Comparison operators */
+less : 3 < 5;           /* true */
+greater : 10 > 5;       /* true */
+equal : 5 = 5;          /* true */
+not_equal : 3 != 5;     /* true */
+less_equal : 5 <= 5;    /* true */
+greater_equal : 5 >= 3; /* true */
+
+/* Logical operators */
+and_result : 1 and 1;   /* true */
+or_result : 0 or 1;     /* true */
+xor_result : 1 xor 0;   /* true */
+not_result : not 0;     /* true */
+```
+
+### Comments
+
+The language supports C-style block comments:
+
+```
+/* This is a single line comment */
+
+/* This is a multi-line comment
+   that spans multiple lines */
+
+x : 5; /* Comment on same line as code */
+
+/* Nested comments are supported */
+/* Outer comment /* Inner comment */ More outer comment */
+```
+
+**Comment Features:**
+- Block comments start with `/*` and end with `*/`
+- Comments can span multiple lines
+- Comments can appear on the same line as code
+- Nested comments are supported
+- Comments are completely ignored by the lexer and parser
+
+### Input/Output Operations
+
+The language provides built-in IO operations for reading from stdin and writing to stdout:
+
+```
+name : ..in;        /* Read input from stdin */
+..out name;         /* Output to stdout */
+..out "Hello";      /* Output string literal */
+..out 42;           /* Output number */
+..assert x = 5;     /* Assert that x equals 5 */
+..assert y > 3;     /* Assert that y is greater than 3 */
+..assert z != 0;    /* Assert that z is not equal to 0 */
+```
+
+**IO Functions:**
+- `..in` - Reads a line from stdin, returns a number if possible, otherwise a string
+- `..out` - Outputs a value to stdout and returns the value
+- `..assert` - Asserts that a comparison is true, throws an error if it's false. Supports all comparison operators: `=`, `<`, `>`, `<=`, `>=`, `!=`
+
+**Note:** The `..` prefix indicates these are impure operations that have side effects.
+
+## Standard Library
+
+The language includes a built-in standard library with functional programming utilities:
+
+### Higher-Order Functions
+
+- **map**: Apply a function to a value (`map f x = f x`)
+- **compose**: Compose two functions (`compose f g x = f(g(x))`)
+- **curry**: Explicit currying (`curry f x y = f x y`)
+- **apply**: Apply a function to an argument (`apply f x = f x`)
+- **pipe**: Compose functions left-to-right (`pipe f g x = g(f(x))`)
+- **filter**: Filter based on a predicate (`filter p x = p(x) ? x : 0`)
+- **reduce**: Reduce to a single value (`reduce f init x = f(init, x)`)
+- **fold**: Same as reduce (`fold f init x = f(init, x)`)
+
+### Usage Examples
+
+```
+double : x -> x * 2;
+square : x -> x * x;
+
+/* Using map */
+result1 : map @double 5;    /* Returns 10 */
+result2 : map @square 3;    /* Returns 9 */
+
+/* Using compose */
+composed : compose @double @square 3;  /* double(square(3)) = 18 */
+
+/* Using pipe */
+piped : pipe @double @square 2;        /* square(double(2)) = 16 */
+
+/* Using filter */
+isPositive : x -> x > 0;
+filtered : filter @isPositive 5;       /* Returns 5 (since 5 > 0) */
+```
+
+
+## Language Components
+
+### Lexer
+
+The lexer tokenizes input into meaningful units:
+- Numbers: `123`
+- Identifiers: `variable_name`
+- Operators: `+`, `-`, `*`, `/`
+- Keywords: `case`, `of`, `function`
+- Symbols: `:`, `->`, `_`
+
+### Parser
+
+The parser builds an Abstract Syntax Tree (AST) from tokens, supporting:
+- Number literals
+- Arithmetic expressions
+- Variable assignments
+- Function declarations
+- Function calls
+- Case expressions
+- Pattern matching
+
+### Interpreter
+
+The interpreter executes the AST with:
+- Global scope management
+- Function evaluation
+- Pattern matching execution
+- Arithmetic computation
+- Immutable variable semantics
+
+## Example Programs
+
+### Basic Arithmetic and Variables
+
+```
+/* Simple arithmetic with variables */
+x : 5;
+y : 10;
+sum : x + y;
+diff : x - y;
+product : x * y;
+quotient : y / x;
+modulo : 17 % 5;        /* Returns 2 */
+power : 2 ^ 3;          /* Returns 8 */
+
+..out sum;      /* 15 */
+..out diff;     /* -5 */
+..out product;  /* 50 */
+..out quotient; /* 2 */
+..out modulo;   /* 2 */
+..out power;    /* 8 */
+
+/* Grouped expressions with parentheses */
+grouped : (5 + 3) * 2;           /* 16 */
+nested : ((5 + 3) * 2) + 1;      /* 17 */
+complex : (2 ^ 3) % 3 and 5 > 3; /* true */
+```
+
+### Function Definitions and Calls
+
+```
+/* Basic function definition */
+add : x y -> x + y;
+multiply : x y -> x * y;
+double : x -> x * 2;
+square : x -> x * x;
+
+/* Function calls */
+result1 : add 3 4;        /* 7 */
+result2 : multiply 5 6;   /* 30 */
+result3 : double 8;       /* 16 */
+result4 : square 4;       /* 16 */
+
+/* Function calls with parenthesized arguments */
+result5 : add (3 + 2) (4 + 1);    /* 15 */
+result6 : add (double 3) (square 2); /* 10 */
+result7 : add (add 1 2) (add 3 4);   /* 10 */
+```
+
+### Tables and Data Structures
+
+```
+/* Create various table types */
+empty : {};
+numbers : {1, 2, 3, 4, 5};
+person : {name: "Alice", age: 30, active: true};
+mixed : {1, name: "Bob", 2, active: false};
+
+/* Access array elements */
+first : numbers[1];
+second : numbers[2];
+last : numbers[5];
+
+/* Access object properties */
+name : person.name;
+age : person.age;
+active : person.active;
+
+/* Access mixed table */
+first_mixed : mixed[1];
+name_mixed : mixed.name;
+second_mixed : mixed[2];
+
+/* Output results */
+..out "First number: ";
+..out first;
+..out "Person name: ";
+..out name;
+..out "Mixed first: ";
+..out first_mixed;
+..out "Mixed name: ";
+..out name_mixed;
+```
+
+### Pattern Matching with Case Expressions
+
+```
+/* Pattern matching in function bodies */
+compare : x y -> 
+  case x y of
+    0 0 : "both zero"
+    0 _ : "x is zero"
+    _ 0 : "y is zero"
+    _ _ : "neither zero";
+
+/* Testing pattern matching */
+test1 : compare 0 0;   /* "both zero" */
+test2 : compare 0 5;   /* "x is zero" */
+test3 : compare 5 0;   /* "y is zero" */
+test4 : compare 5 5;   /* "neither zero" */
+
+/* Single-parameter case expressions */
+factorial : n -> 
+  case n of
+    0 : 1
+    _ : n * (factorial (n - 1));
+
+/* Single-parameter grade function */
+grade : score -> 
+  case score of
+    90 : "A"
+    80 : "B"
+    70 : "C"
+    _  : "F";
+
+fact5 : factorial 5;    /* 120 */
+grade1 : grade 95;      /* "A" */
+grade2 : grade 85;      /* "B" */
+grade3 : grade 65;      /* "F" */
+```
+
+### First-Class Functions and Composition
+
+```
+/* Function references and composition */
+double : x -> x * 2;
+square : x -> x * x;
+add1 : x -> x + 1;
+
+/* Using standard library functions */
+composed : compose @double @square 3;  /* double(square(3)) = 18 */
+piped : pipe @double @square 2;        /* square(double(2)) = 16 */
+applied : apply @double 5;             /* double(5) = 10 */
+
+/* Higher-order functions */
+mapped1 : map @double 5;               /* 10 */
+mapped2 : map @square 3;               /* 9 */
+
+/* Function references in case expressions */
+getFunction : type -> 
+  case type of
+    "double" : @double
+    "square" : @square
+    _        : @add1;
+
+func1 : getFunction "double";  /* Function reference */
+func2 : getFunction "square";  /* Function reference */
+```
+
+### Recursion and Complex Functions
+
+```
+/* Recursive factorial function (using single-parameter case) */
+factorial : n -> 
+  case n of
+    0 : 1
+    _ : n * (factorial (n - 1));
+
+/* Recursive countdown function */
+countdown : n -> 
+  case n of
+    0 : "done"
+    _ : countdown (n - 1);
+
+/* Testing recursive functions */
+fact5 : factorial 5;    /* 120 */
+count : countdown 3;    /* "done" */
+```
+
+### Comparison and Logical Operators
+
+```
+/* Comparison operators */
+a : 5;
+b : 10;
+
+less : a < b;           /* true */
+greater : b > a;        /* true */
+equal : a = a;          /* true */
+notEqual : a != b;      /* true */
+lessEqual : a <= 5;     /* true */
+greaterEqual : b >= 10; /* true */
+
+/* Logical operators */
+logicalAnd : 1 and 1;   /* true */
+logicalOr : 0 or 1;     /* true */
+logicalXor : 1 xor 0;   /* true */
+logicalNot : not 0;     /* true */
+
+/* Complex logical expressions */
+complex1 : a < b and b > 5;           /* true */
+complex2 : a = 5 or b = 15;           /* true */
+complex3 : not (a = b);               /* true */
+```
+
+### Input/Output and Assertions
+
+```
+/* Interactive input/output */
+..out "Enter your name: ";
+name : ..in;
+..out "Hello, ";
+..out name;
+..out "!";
+
+/* Assertions for testing */
+x : 5;
+y : 3;
+sum : x + y;
+
+..assert x = 5;            /* Passes */
+..assert y = 3;            /* Passes */
+..assert sum = 8;          /* Passes */
+..assert x > 3;            /* Passes */
+..assert y < 10;           /* Passes */
+..assert sum != 0;         /* Passes */
+..assert (add 3 4) = 7;    /* Passes (with parentheses) */
+
+/* String comparisons */
+..assert "hello" = "hello";  /* Passes */
+..assert "world" != "hello"; /* Passes */
+```
+
+### Standard Library Functions
+
+```
+/* Using all standard library functions */
+double : x -> x * 2;
+square : x -> x * x;
+add : x y -> x + y;
+isPositive : x -> x > 0;
+
+/* Map function */
+mapped1 : map @double 5;    /* 10 */
+mapped2 : map @square 3;    /* 9 */
+
+/* Compose function */
+composed : compose @double @square 3;  /* 18 */
+
+/* Pipe function */
+piped : pipe @double @square 2;        /* 16 */
+
+/* Apply function */
+applied : apply @double 7;             /* 14 */
+
+/* Filter function */
+filtered : filter @isPositive 5;       /* 5 (since 5 > 0) */
+filtered2 : filter @isPositive -3;     /* 0 (since -3 <= 0) */
+
+/* Reduce and Fold functions */
+reduced : reduce @add 0 5;             /* 5 */
+folded : fold @add 0 5;                /* 5 */
+
+/* Curry function (explicit currying) */
+curried : curry @add 3 4;              /* 7 */
+```
+
+### Complete Program Example
+
+```
+/* A complete program demonstrating multiple features */
+..out "Welcome to the Calculator!";
+
+/* Define arithmetic functions */
+add : x y -> x + y;
+subtract : x y -> x - y;
+multiply : x y -> x * y;
+divide : x y -> x / y;
+
+/* Define utility functions */
+double : x -> x * 2;
+square : x -> x * x;
+isEven : x -> x % 2 = 0;
+
+/* Get user input */
+..out "Enter first number: ";
+num1 : ..in;
+..out "Enter second number: ";
+num2 : ..in;
+
+/* Perform calculations */
+sum : add num1 num2;
+diff : subtract num1 num2;
+prod : multiply num1 num2;
+quot : divide num1 num2;
+
+/* Display results */
+..out "Sum: ";
+..out sum;
+..out "Difference: ";
+..out diff;
+..out "Product: ";
+..out prod;
+..out "Quotient: ";
+..out quot;
+
+/* Use higher-order functions */
+doubledSum : double sum;
+squaredDiff : square diff;
+
+..out "Doubled sum: ";
+..out doubledSum;
+..out "Squared difference: ";
+..out squaredDiff;
+
+/* Pattern matching for number classification */
+classify : num -> 
+  case num of
+    0 : "zero"
+    _ : case isEven num of
+         true : "even"
+         _    : "odd";
+
+classification : classify num1;
+..out "First number is: ";
+..out classification;
+
+/* Assertions to verify calculations */
+..assert sum = add num1 num2;
+..assert diff = subtract num1 num2;
+..assert prod = multiply num1 num2;
+
+..out "All calculations verified!";
+```
+
+## Running Programs
+
+The language supports file execution mode only:
+
+### File Execution Mode
+Run a script file by providing the file path as an argument:
+
+```bash
+node lang.js script.txt
+```
+
+**Note:** REPL mode has been removed in the simplified version. The language now only supports file execution.
+
+## Testing
+
+The language includes a comprehensive test suite to verify functionality:
+
+### Test Structure
+
+- **Unit Tests** (`tests/01_*.txt` to `tests/10_*.txt`): Test individual language features in isolation
+- **Integration Tests** (`tests/integration_*.txt`): Test combinations of multiple features
+- **Test Runner** (`run_tests.sh`): Automated test execution with pass/fail reporting
+
+### Running Tests
+
+**Run all tests:**
+```bash
+./run_tests.sh
+```
+
+**Run individual tests:**
+```bash
+node lang.js tests/01_lexer_basic.txt
+node lang.js tests/07_case_expressions.txt
+node lang.js tests/integration_01_basic_features.txt
+```
+
+### Test Coverage
+
+The test suite covers:
+- Basic lexer functionality (numbers, identifiers, operators, keywords)
+- Arithmetic operations (all operators, precedence, parentheses)
+- Comparison operators (all comparison types, edge cases)
+- Logical operators (and, or, xor, not, complex expressions)
+- IO operations (output, assertions, string comparisons)
+- Function definitions (syntax, parameters, calls, parentheses)
+- Case expressions (pattern matching, wildcards, recursion)
+- First-class functions (references, higher-order functions)
+- Tables (literals, access, mixed types)
+- Standard library (all built-in higher-order functions)
+- Integration scenarios (feature combinations, complex patterns)
+
+### Testing Strategy
+
+The testing approach focuses on:
+1. **Isolation**: Each unit test focuses on a single language feature
+2. **Integration**: Integration tests verify feature combinations work correctly
+3. **Edge Cases**: Tests include boundary conditions and error scenarios
+4. **Automation**: Test runner provides systematic execution and reporting
+
+## Language Design Principles
+
+- **Simplicity**: Minimal syntax for maximum clarity
+- **Immutability**: Variables cannot be reassigned
+- **Functional**: Functions are first-class values with composition support
+- **Pattern-oriented**: Pattern matching as a core feature
+- **Recursive**: Support for recursive function calls in function bodies
+- **Grouped**: Parentheses support for complex arithmetic expressions
+- **Expressive**: Rich set of arithmetic, comparison, and logical operators
+- **IO-aware**: Built-in input/output operations with clear impurity markers
+- **Educational**: Designed to teach language implementation concepts
+
+## Limitations
+
+This is a learning language with intentional limitations:
+- Complex nested function calls (e.g., `add double 3 square 2`) are ambiguous without explicit grouping
+- There's one known issue with function calls inside assertions (e.g., ..assert add 3 4 = 7), which is a parsing edge case. Workaround: use parentheses around function calls in assertions (e.g., ..assert (add 3 4) = 7)
+- Limited to immutable data structures (no mutation operations)
+- No error handling beyond basic validation
+- No modules or imports
+- IO operations are synchronous and block execution
+
+## Future Enhancements
+
+Planned features for future versions:
+- Ambiguous function call detection and error reporting
+- Lists and data structures
+- Error handling
+- Modules and imports
+- Performance optimizations
+
+## Implementation Details
+
+The language is implemented in JavaScript with three main components:
+
+1. **Lexer** (`lexer()`): Converts source code to tokens
+2. **Parser** (`parser()`): Builds AST from tokens
+3. **Interpreter** (`interpreter()`): Executes AST
+
+Each component is designed to be modular and extensible for adding new language features.
+
+## Files
+
+- `lang.js` - Main language implementation
+- `table_basic_test.txt` - Basic table functionality tests
+- `table_edge_cases_test.txt` - Advanced table edge cases (some features may not work)
+- `README.md` - This documentation
+- `NEXT-STEPS.md` - Development roadmap and notes 
\ No newline at end of file
diff --git a/js/scripting-lang/analyze_test_differences.sh b/js/scripting-lang/analyze_test_differences.sh
new file mode 100755
index 0000000..41a2ced
--- /dev/null
+++ b/js/scripting-lang/analyze_test_differences.sh
@@ -0,0 +1,105 @@
+#!/bin/bash
+
+# Script to analyze differences between working tests and problematic test.txt
+
+echo "=== Test Analysis Tool ==="
+echo ""
+
+echo "1. Checking file sizes:"
+echo "   Working test files:"
+for file in tests/*.txt; do
+    if [ -f "$file" ]; then
+        lines=$(wc -l < "$file")
+        echo "   - $(basename "$file"): $lines lines"
+    fi
+done
+
+echo ""
+echo "   Original test.txt:"
+if [ -f "test.txt" ]; then
+    lines=$(wc -l < "test.txt")
+    echo "   - test.txt: $lines lines"
+else
+    echo "   - test.txt: not found"
+fi
+
+echo ""
+echo "2. Testing sections of test.txt:"
+
+if [ -f "test.txt" ]; then
+    # Extract first 50 lines and test
+    echo "   Testing first 50 lines..."
+    head -50 test.txt > temp_section1.txt
+    if node lang.js temp_section1.txt > /dev/null 2>&1; then
+        echo "   ✅ First 50 lines: PASS"
+    else
+        echo "   ❌ First 50 lines: FAIL"
+    fi
+    rm temp_section1.txt
+
+    # Extract lines 51-100 and test
+    echo "   Testing lines 51-100..."
+    sed -n '51,100p' test.txt > temp_section2.txt
+    if [ -s temp_section2.txt ]; then
+        if node lang.js temp_section2.txt > /dev/null 2>&1; then
+            echo "   ✅ Lines 51-100: PASS"
+        else
+            echo "   ❌ Lines 51-100: FAIL"
+        fi
+    else
+        echo "   ⚠️  Lines 51-100: Empty"
+    fi
+    rm temp_section2.txt
+
+    # Extract lines 101-150 and test
+    echo "   Testing lines 101-150..."
+    sed -n '101,150p' test.txt > temp_section3.txt
+    if [ -s temp_section3.txt ]; then
+        if node lang.js temp_section3.txt > /dev/null 2>&1; then
+            echo "   ✅ Lines 101-150: PASS"
+        else
+            echo "   ❌ Lines 101-150: FAIL"
+        fi
+    else
+        echo "   ⚠️  Lines 101-150: Empty"
+    fi
+    rm temp_section3.txt
+
+    # Continue with more sections if needed
+    echo "   Testing lines 151-200..."
+    sed -n '151,200p' test.txt > temp_section4.txt
+    if [ -s temp_section4.txt ]; then
+        if node lang.js temp_section4.txt > /dev/null 2>&1; then
+            echo "   ✅ Lines 151-200: PASS"
+        else
+            echo "   ❌ Lines 151-200: FAIL"
+        fi
+    else
+        echo "   ⚠️  Lines 151-200: Empty"
+    fi
+    rm temp_section4.txt
+
+else
+    echo "   test.txt not found"
+fi
+
+echo ""
+echo "3. Unique constructs in test.txt:"
+if [ -f "test.txt" ]; then
+    echo "   Checking for unique patterns..."
+    
+    # Look for unique function call patterns
+    echo "   - Function calls with complex nesting:"
+    grep -n "add.*add.*add" test.txt | head -3
+    
+    # Look for unique case expression patterns
+    echo "   - Complex case expressions:"
+    grep -n "case.*case.*case" test.txt | head -3
+    
+    # Look for unique table patterns
+    echo "   - Complex table literals:"
+    grep -n "\\{.*\\{.*\\}" test.txt | head -3
+fi
+
+echo ""
+echo "Analysis complete." 
\ No newline at end of file
diff --git a/js/scripting-lang/input.txt b/js/scripting-lang/input.txt
deleted file mode 100644
index d343086..0000000
--- a/js/scripting-lang/input.txt
+++ /dev/null
@@ -1,3 +0,0 @@
-x : 10;
-y : 20;
-x + y;
\ No newline at end of file
diff --git a/js/scripting-lang/lang.js b/js/scripting-lang/lang.js
index f91f842..3de7a0e 100644
--- a/js/scripting-lang/lang.js
+++ b/js/scripting-lang/lang.js
@@ -1,320 +1,1672 @@
 // The goal here is less to make anything useful...or even something that works, but to learn what parts an interpreted languages needs to have to function.
 
+// Initialize standard library functions
+function initializeStandardLibrary(scope) {
+    // Map: Apply a function to each element
+    scope.map = function(f, x) { 
+        // Handle function references by calling them if they're functions
+        if (typeof f === 'function') {
+            return f(x);
+        } else {
+            throw new Error('map: first argument must be a function');
+        }
+    };
+    
+    // Compose: Compose two functions (f ∘ g)(x) = f(g(x))
+    scope.compose = function(f, g, x) { 
+        if (typeof f === 'function' && typeof g === 'function') {
+            return f(g(x));
+        } else {
+            throw new Error('compose: first two arguments must be functions');
+        }
+    };
+    
+    // Curry: Convert a function that takes multiple arguments into a series of functions
+    // Since our language already uses curried functions by default, this is mostly for explicit currying
+    scope.curry = function(f, x, y) { 
+        if (typeof f === 'function') {
+            return f(x, y);
+        } else {
+            throw new Error('curry: first argument must be a function');
+        }
+    };
+    
+    // Apply: Apply a function to an argument (same as function call, but more explicit)
+    scope.apply = function(f, x) { 
+        if (typeof f === 'function') {
+            return f(x);
+        } else {
+            throw new Error('apply: first argument must be a function');
+        }
+    };
+    
+    // Pipe: Compose functions in left-to-right order (opposite of compose)
+    // pipe f g x = g f x
+    scope.pipe = function(f, g, x) { 
+        if (typeof f === 'function' && typeof g === 'function') {
+            return g(f(x));
+        } else {
+            throw new Error('pipe: first two arguments must be functions');
+        }
+    };
+    
+    // Filter: Filter based on a predicate
+    // For now, we'll implement it as a higher-order function
+    scope.filter = function(p, x) { 
+        if (typeof p === 'function') {
+            return p(x) ? x : 0;
+        } else {
+            throw new Error('filter: first argument must be a function');
+        }
+    };
+    
+    // Reduce: Reduce to a single value using a binary function
+    // For now, we'll implement it as a higher-order function
+    scope.reduce = function(f, init, x) { 
+        if (typeof f === 'function') {
+            return f(init, x);
+        } else {
+            throw new Error('reduce: first argument must be a function');
+        }
+    };
+    
+    // Fold: Same as reduce, but more explicit about the folding direction
+    scope.fold = function(f, init, x) { 
+        if (typeof f === 'function') {
+            return f(init, x);
+        } else {
+            throw new Error('fold: first argument must be a function');
+        }
+    };
+}
+
 // Define the types of tokens
 const TokenType = {
     NUMBER: 'NUMBER',
     PLUS: 'PLUS',
+    MINUS: 'MINUS',
+    MULTIPLY: 'MULTIPLY',
+    DIVIDE: 'DIVIDE',
     IDENTIFIER: 'IDENTIFIER',
     ASSIGNMENT: 'ASSIGNMENT',
+    ARROW: 'ARROW',
+    CASE: 'CASE',
+    OF: 'OF',
+    WILDCARD: 'WILDCARD',
     FUNCTION: 'FUNCTION',
     LEFT_PAREN: 'LEFT_PAREN',
     RIGHT_PAREN: 'RIGHT_PAREN',
     LEFT_BRACE: 'LEFT_BRACE',
     RIGHT_BRACE: 'RIGHT_BRACE',
+    LEFT_BRACKET: 'LEFT_BRACKET',
+    RIGHT_BRACKET: 'RIGHT_BRACKET',
     SEMICOLON: 'SEMICOLON',
+    COMMA: 'COMMA',
+    DOT: 'DOT',
+    STRING: 'STRING',
+    TRUE: 'TRUE',
+    FALSE: 'FALSE',
+    AND: 'AND',
+    OR: 'OR',
+    XOR: 'XOR',
+    NOT: 'NOT',
+    EQUALS: 'EQUALS',
+    LESS_THAN: 'LESS_THAN',
+    GREATER_THAN: 'GREATER_THAN',
+    LESS_EQUAL: 'LESS_EQUAL',
+    GREATER_EQUAL: 'GREATER_EQUAL',
+    NOT_EQUAL: 'NOT_EQUAL',
+    MODULO: 'MODULO',
+    POWER: 'POWER',
+    IO_IN: 'IO_IN',
+    IO_OUT: 'IO_OUT',
+    IO_ASSERT: 'IO_ASSERT',
+    FUNCTION_REF: 'FUNCTION_REF'
 };
 
-// Lexer
+// Lexer - converts source code to tokens
 function lexer(input) {
-    const tokens = [];
     let current = 0;
-
+    const tokens = [];
+    
     while (current < input.length) {
         let char = input[current];
-
-        if (/\d/.test(char)) {
-            let value = '';
-            while (/\d/.test(char)) {
-                value += char;
-                char = input[++current];
-            }
-            tokens.push({
-                type: TokenType.NUMBER,
-                value
-            });
-            continue;
-        }
-
-        if (char === '+') {
-            tokens.push({
-                type: TokenType.PLUS
-            });
+        
+        // Skip whitespace
+        if (/\s/.test(char)) {
             current++;
             continue;
         }
-
-        if (/[a-z]/i.test(char)) {
-            let value = '';
-            while (/[a-z]/i.test(char)) {
-                value += char;
-                char = input[++current];
+        
+        // Skip comments
+        if (char === '/' && input[current + 1] === '*') {
+            let commentDepth = 1;
+            current += 2; // Skip /*
+            
+            while (current < input.length && commentDepth > 0) {
+                if (input[current] === '/' && input[current + 1] === '*') {
+                    commentDepth++;
+                    current += 2;
+                } else if (input[current] === '*' && input[current + 1] === '/') {
+                    commentDepth--;
+                    current += 2;
+                } else {
+                    current++;
+                }
             }
-            tokens.push({
-                type: TokenType.IDENTIFIER,
-                value
-            });
-            continue;
-        }
-
-        if (char === ':') {
-            tokens.push({
-                type: TokenType.ASSIGNMENT
-            });
-            current++;
-            continue;
-        }
-
-        if (char === '=') {
-            tokens.push({
-                type: TokenType.EQUAL
-            });
-            current++;
-            continue;
-        }
-
-        if (input.slice(current, current + 2) === 'if') {
-            tokens.push({
-                type: TokenType.IF
-            });
-            current += 2;
-            continue;
-        }
-
-        if (input.slice(current, current + 4) === 'else') {
-            tokens.push({
-                type: TokenType.ELSE
-            });
-            current += 4;
             continue;
         }
-
-        if (char === '(') {
-            tokens.push({
-                type: TokenType.LEFT_PAREN
-            });
-            current++;
-            continue;
-        }
-
-        if (char === ')') {
-            tokens.push({
-                type: TokenType.RIGHT_PAREN
-            });
-            current++;
+        
+        // Numbers
+        if (/[0-9]/.test(char)) {
+            let value = '';
+            while (current < input.length && /[0-9]/.test(input[current])) {
+                value += input[current];
+                current++;
+            }
+            
+            // Check for decimal point
+            if (current < input.length && input[current] === '.') {
+                value += input[current];
+                current++;
+                
+                // Parse decimal part
+                while (current < input.length && /[0-9]/.test(input[current])) {
+                    value += input[current];
+                    current++;
+                }
+                
+                tokens.push({
+                    type: TokenType.NUMBER,
+                    value: parseFloat(value)
+                });
+            } else {
+                tokens.push({
+                    type: TokenType.NUMBER,
+                    value: parseInt(value)
+                });
+            }
             continue;
         }
-
-        if (char === '{') {
-            tokens.push({
-                type: TokenType.LEFT_BRACE
-            });
-            current++;
+        
+        // Strings
+        if (char === '"') {
+            let value = '';
+            current++; // Skip opening quote
+            
+            while (current < input.length && input[current] !== '"') {
+                value += input[current];
+                current++;
+            }
+            
+            if (current < input.length) {
+                current++; // Skip closing quote
+                tokens.push({
+                    type: TokenType.STRING,
+                    value: value
+                });
+            } else {
+                throw new Error('Unterminated string');
+            }
             continue;
         }
-
-        if (char === '}') {
-            tokens.push({
-                type: TokenType.RIGHT_BRACE
-            });
-            current++;
+        
+        // Identifiers and keywords
+        if (/[a-zA-Z_]/.test(char)) {
+            let value = '';
+            while (current < input.length && /[a-zA-Z0-9_]/.test(input[current])) {
+                value += input[current];
+                current++;
+            }
+            
+            // Check for keywords
+            switch (value) {
+                case 'case':
+                    tokens.push({ type: TokenType.CASE });
+                    break;
+                case 'of':
+                    tokens.push({ type: TokenType.OF });
+                    break;
+                case 'function':
+                    tokens.push({ type: TokenType.FUNCTION });
+                    break;
+                case 'true':
+                    tokens.push({ type: TokenType.TRUE });
+                    break;
+                case 'false':
+                    tokens.push({ type: TokenType.FALSE });
+                    break;
+                case 'and':
+                    tokens.push({ type: TokenType.AND });
+                    break;
+                case 'or':
+                    tokens.push({ type: TokenType.OR });
+                    break;
+                case 'xor':
+                    tokens.push({ type: TokenType.XOR });
+                    break;
+                case 'not':
+                    tokens.push({ type: TokenType.NOT });
+                    break;
+                case '_':
+                    tokens.push({ type: TokenType.WILDCARD });
+                    break;
+                default:
+                    tokens.push({
+                        type: TokenType.IDENTIFIER,
+                        value: value
+                    });
+            }
             continue;
         }
-
-        if (input.slice(current, current + 8) === 'function') {
-            tokens.push({
-                type: TokenType.FUNCTION
-            });
-            current += 8;
-            continue;
+        
+        // Two-character operators
+        if (current + 1 < input.length) {
+            const twoChar = char + input[current + 1];
+            switch (twoChar) {
+                case '->':
+                    tokens.push({ type: TokenType.ARROW });
+                    current += 2;
+                    continue;
+                case '==':
+                    tokens.push({ type: TokenType.EQUALS });
+                    current += 2;
+                    continue;
+                case '!=':
+                    tokens.push({ type: TokenType.NOT_EQUAL });
+                    current += 2;
+                    continue;
+                case '<=':
+                    tokens.push({ type: TokenType.LESS_EQUAL });
+                    current += 2;
+                    continue;
+                case '>=':
+                    tokens.push({ type: TokenType.GREATER_EQUAL });
+                    current += 2;
+                    continue;
+                case '..':
+                    // Check for IO operations
+                    if (current + 2 < input.length) {
+                        const ioChar = input[current + 2];
+                        switch (ioChar) {
+                            case 'i':
+                                if (current + 3 < input.length && input[current + 3] === 'n') {
+                                    tokens.push({ type: TokenType.IO_IN });
+                                    current += 4;
+                                    continue;
+                                }
+                                break;
+                            case 'o':
+                                if (current + 3 < input.length && input[current + 3] === 'u') {
+                                    if (current + 4 < input.length && input[current + 4] === 't') {
+                                        tokens.push({ type: TokenType.IO_OUT });
+                                        current += 5;
+                                        continue;
+                                    }
+                                }
+                                break;
+                            case 'a':
+                                if (current + 3 < input.length && input[current + 3] === 's') {
+                                    if (current + 4 < input.length && input[current + 4] === 's') {
+                                        if (current + 5 < input.length && input[current + 5] === 'e') {
+                                            if (current + 6 < input.length && input[current + 6] === 'r') {
+                                                if (current + 7 < input.length && input[current + 7] === 't') {
+                                                    tokens.push({ type: TokenType.IO_ASSERT });
+                                                    current += 8;
+                                                    continue;
+                                                }
+                                            }
+                                        }
+                                    }
+                                }
+                                break;
+                        }
+                    }
+                    // If we get here, it's not a complete IO operation, so skip the '..'
+                    current += 2;
+                    continue;
+            }
         }
-
-        if (char === ';') {
-            tokens.push({ type: TokenType.SEMICOLON });
-            current++;
-            continue;
+        
+        // Single character operators
+        switch (char) {
+            case '+':
+                tokens.push({ type: TokenType.PLUS });
+                break;
+            case '-':
+                tokens.push({ type: TokenType.MINUS });
+                break;
+            case '*':
+                tokens.push({ type: TokenType.MULTIPLY });
+                break;
+            case '/':
+                tokens.push({ type: TokenType.DIVIDE });
+                break;
+            case '%':
+                tokens.push({ type: TokenType.MODULO });
+                break;
+            case '^':
+                tokens.push({ type: TokenType.POWER });
+                break;
+            case ':':
+                tokens.push({ type: TokenType.ASSIGNMENT });
+                break;
+            case '(':
+                tokens.push({ type: TokenType.LEFT_PAREN });
+                break;
+            case ')':
+                tokens.push({ type: TokenType.RIGHT_PAREN });
+                break;
+            case '{':
+                tokens.push({ type: TokenType.LEFT_BRACE });
+                break;
+            case '}':
+                tokens.push({ type: TokenType.RIGHT_BRACE });
+                break;
+            case '[':
+                tokens.push({ type: TokenType.LEFT_BRACKET });
+                break;
+            case ']':
+                tokens.push({ type: TokenType.RIGHT_BRACKET });
+                break;
+            case ';':
+                tokens.push({ type: TokenType.SEMICOLON });
+                break;
+            case ',':
+                tokens.push({ type: TokenType.COMMA });
+                break;
+            case '.':
+                tokens.push({ type: TokenType.DOT });
+                break;
+            case '@':
+                tokens.push({ type: TokenType.FUNCTION_REF });
+                break;
+            case '_':
+                tokens.push({ type: TokenType.WILDCARD });
+                break;
+            case '=':
+                tokens.push({ type: TokenType.EQUALS });
+                break;
+            case '<':
+                tokens.push({ type: TokenType.LESS_THAN });
+                break;
+            case '>':
+                tokens.push({ type: TokenType.GREATER_THAN });
+                break;
+            default:
+                throw new Error(`Unexpected character: ${char}`);
         }
-
+        
         current++;
     }
-
+    
     return tokens;
 }
 
-// Parser
+// Parser - converts tokens to AST
 function parser(tokens) {
     let current = 0;
-
+    
     function walk() {
-        if (current >= tokens.length) {
-            return null; // Return null when there are no more tokens
+        function parseChainedDotAccess(tableExpr) {
+            let result = tableExpr;
+            
+            while (current < tokens.length && tokens[current].type === TokenType.DOT) {
+                current++; // Skip the dot
+                
+                if (current < tokens.length && tokens[current].type === TokenType.IDENTIFIER) {
+                    const key = {
+                        type: 'Identifier',
+                        value: tokens[current].value
+                    };
+                    current++;
+                    
+                    result = {
+                        type: 'TableAccess',
+                        table: result,
+                        key: key
+                    };
+                } else {
+                    throw new Error('Expected identifier after dot');
+                }
+            }
+            
+            return result;
         }
-
-        let token = tokens[current];
-
-        if (token.type === TokenType.NUMBER) {
-            current++;
-            return {
-                type: 'NumberLiteral',
-                value: token.value,
-            };
+        
+        function parseChainedTableAccess(tableExpr) {
+            if (current < tokens.length && tokens[current].type === TokenType.LEFT_BRACKET) {
+                current++; // Skip '['
+                const keyExpr = walk();
+                
+                if (current < tokens.length && tokens[current].type === TokenType.RIGHT_BRACKET) {
+                    current++; // Skip ']'
+                    
+                    const access = {
+                        type: 'TableAccess',
+                        table: tableExpr,
+                        key: keyExpr
+                    };
+                    
+                    // Check for chained access
+                    if (current < tokens.length && tokens[current].type === TokenType.DOT) {
+                        return parseChainedDotAccess(access);
+                    }
+                    
+                    // Check if this is a function call
+                    if (current < tokens.length && 
+                        (tokens[current].type === TokenType.IDENTIFIER || 
+                         tokens[current].type === TokenType.NUMBER ||
+                         tokens[current].type === TokenType.STRING ||
+                         tokens[current].type === TokenType.LEFT_PAREN)) {
+                        return parseFunctionCall(access);
+                    }
+                    
+                    return access;
+                } else {
+                    throw new Error('Expected closing bracket');
+                }
+            }
+            
+            // Check for dot access
+            if (current < tokens.length && tokens[current].type === TokenType.DOT) {
+                const result = parseChainedDotAccess(tableExpr);
+                
+                // Check if this is a function call
+                if (current < tokens.length && 
+                    (tokens[current].type === TokenType.IDENTIFIER || 
+                     tokens[current].type === TokenType.NUMBER ||
+                     tokens[current].type === TokenType.STRING ||
+                     tokens[current].type === TokenType.LEFT_PAREN)) {
+                    return parseFunctionCall(result);
+                }
+                
+                return result;
+            }
+            
+            return tableExpr;
         }
-
-        if (token.type === TokenType.PLUS) {
-            current++;
-            return {
-                type: 'PlusExpression',
-                left: walk(),
-                right: walk(),
-            };
+        
+        function detectAmbiguousFunctionCalls() {
+            // This is a placeholder for future ambiguous function call detection
+            // For now, we'll assume the parser handles function calls correctly
         }
-
-        if (token.type === TokenType.IDENTIFIER) {
-            current++;
+        
+        function parseFunctionCall(functionName) {
+            const args = [];
+            
+            // Parse arguments until we hit a semicolon or other terminator
+            while (current < tokens.length && 
+                   tokens[current].type !== TokenType.SEMICOLON &&
+                   tokens[current].type !== TokenType.RIGHT_PAREN &&
+                   tokens[current].type !== TokenType.RIGHT_BRACE &&
+                   tokens[current].type !== TokenType.COMMA) {
+                args.push(parseExpression());
+            }
+            
             return {
-                type: 'Identifier',
-                value: token.value,
+                type: 'FunctionCall',
+                name: functionName,
+                args: args
             };
         }
-
-        if (token.type === TokenType.ASSIGNMENT) {
-            current++;
-            return {
-                type: 'AssignmentExpression',
-                name: tokens[current - 2].value,
-                value: walk(),
-            };
+        
+        function parseExpression() {
+            let left = parseTerm();
+            
+            while (current < tokens.length && 
+                   (tokens[current].type === TokenType.PLUS || 
+                    tokens[current].type === TokenType.MINUS ||
+                    tokens[current].type === TokenType.EQUALS ||
+                    tokens[current].type === TokenType.NOT_EQUAL ||
+                    tokens[current].type === TokenType.LESS_THAN ||
+                    tokens[current].type === TokenType.GREATER_THAN ||
+                    tokens[current].type === TokenType.LESS_EQUAL ||
+                    tokens[current].type === TokenType.GREATER_EQUAL ||
+                    tokens[current].type === TokenType.AND ||
+                    tokens[current].type === TokenType.OR ||
+                    tokens[current].type === TokenType.XOR)) {
+                
+                const operator = tokens[current].type;
+                current++;
+                const right = parseTerm();
+                
+                switch (operator) {
+                    case TokenType.PLUS:
+                        left = { type: 'PlusExpression', left, right };
+                        break;
+                    case TokenType.MINUS:
+                        left = { type: 'MinusExpression', left, right };
+                        break;
+                    case TokenType.EQUALS:
+                        left = { type: 'EqualsExpression', left, right };
+                        break;
+                    case TokenType.NOT_EQUAL:
+                        left = { type: 'NotEqualExpression', left, right };
+                        break;
+                    case TokenType.LESS_THAN:
+                        left = { type: 'LessThanExpression', left, right };
+                        break;
+                    case TokenType.GREATER_THAN:
+                        left = { type: 'GreaterThanExpression', left, right };
+                        break;
+                    case TokenType.LESS_EQUAL:
+                        left = { type: 'LessEqualExpression', left, right };
+                        break;
+                    case TokenType.GREATER_EQUAL:
+                        left = { type: 'GreaterEqualExpression', left, right };
+                        break;
+                    case TokenType.AND:
+                        left = { type: 'AndExpression', left, right };
+                        break;
+                    case TokenType.OR:
+                        left = { type: 'OrExpression', left, right };
+                        break;
+                    case TokenType.XOR:
+                        left = { type: 'XorExpression', left, right };
+                        break;
+                }
+            }
+            
+            return left;
         }
-
-        if (token.type === TokenType.IF) {
-            current++;
-            let node = {
-                type: 'IfExpression',
-                test: walk(),
-                consequent: walk(),
-                alternate: tokens[current].type === TokenType.ELSE ? (current++, walk()) : null,
-            };
-            return node;
+        
+        function parseTerm() {
+            let left = parseFactor();
+            
+            while (current < tokens.length && 
+                   (tokens[current].type === TokenType.MULTIPLY || 
+                    tokens[current].type === TokenType.DIVIDE ||
+                    tokens[current].type === TokenType.MODULO)) {
+                
+                const operator = tokens[current].type;
+                current++;
+                const right = parseFactor();
+                
+                switch (operator) {
+                    case TokenType.MULTIPLY:
+                        left = { type: 'MultiplyExpression', left, right };
+                        break;
+                    case TokenType.DIVIDE:
+                        left = { type: 'DivideExpression', left, right };
+                        break;
+                    case TokenType.MODULO:
+                        left = { type: 'ModuloExpression', left, right };
+                        break;
+                }
+            }
+            
+            return left;
         }
+        
+        function parseFactor() {
+            let left = parsePrimary();
+            
+            while (current < tokens.length && tokens[current].type === TokenType.POWER) {
+                current++;
+                const right = parsePrimary();
+                left = { type: 'PowerExpression', left, right };
+            }
+            
+            return left;
+        }
+        
+        function parsePrimary() {
+            const token = tokens[current];
+            
+            if (token.type === TokenType.NOT) {
+                current++;
+                const operand = parsePrimary();
+                return { type: 'NotExpression', operand };
+            }
+            
+            if (token.type === TokenType.NUMBER) {
+                current++;
+                return {
+                    type: 'NumberLiteral',
+                    value: token.value
+                };
+            }
+            
+            if (token.type === TokenType.STRING) {
+                current++;
+                return {
+                    type: 'StringLiteral',
+                    value: token.value
+                };
+            }
+            
+            if (token.type === TokenType.TRUE) {
+                current++;
+                return {
+                    type: 'BooleanLiteral',
+                    value: true
+                };
+            }
+            
+            if (token.type === TokenType.FALSE) {
+                current++;
+                return {
+                    type: 'BooleanLiteral',
+                    value: false
+                };
+            }
+            
+            if (token.type === TokenType.LEFT_PAREN) {
+                current++; // Skip '('
+                const parenthesizedExpr = parseExpression();
+                
+                if (current < tokens.length && tokens[current].type === TokenType.RIGHT_PAREN) {
+                    current++; // Skip ')'
+                    return parenthesizedExpr;
+                } else {
+                    throw new Error('Expected closing parenthesis');
+                }
+            }
+            
+            if (token.type === TokenType.IDENTIFIER) {
+                const identifier = {
+                    type: 'Identifier',
+                    value: token.value
+                };
+                current++;
+                
+                // Check if this is an assignment
+                if (current < tokens.length && tokens[current].type === TokenType.ASSIGNMENT) {
+                    current++; // Skip ':'
+                    
+                    // Check if this is a function definition
+                    let isFunction = false;
+                    let params = [];
+                    
+                    // Look ahead to see if this is a function definition
+                    let lookAhead = current;
+                    while (lookAhead < tokens.length && 
+                           tokens[lookAhead].type !== TokenType.ARROW && 
+                           tokens[lookAhead].type !== TokenType.SEMICOLON) {
+                        if (tokens[lookAhead].type === TokenType.IDENTIFIER) {
+                            params.push(tokens[lookAhead].value);
+                        }
+                        lookAhead++;
+                    }
+                    
+                    if (lookAhead < tokens.length && tokens[lookAhead].type === TokenType.ARROW) {
+                        isFunction = true;
+                    }
+                    
+                    if (isFunction) {
+                        // Clear params array and parse function parameters
+                        params = [];
+                        while (current < tokens.length && tokens[current].type !== TokenType.ARROW) {
+                            if (tokens[current].type === TokenType.IDENTIFIER) {
+                                params.push(tokens[current].value);
+                            }
+                            current++;
+                        }
+                        
+                        current++; // Skip '->'
+                        
+                        // Parse the function body (which could be a case expression or other expression)
+                        const functionBody = parseExpression();
+                        
+                        return {
+                            type: 'AssignmentExpression',
+                            name: identifier.value,
+                            value: {
+                                type: 'FunctionDeclaration',
+                                name: null, // Anonymous function
+                                params,
+                                body: functionBody,
+                            }
+                        };
+                    } else {
+                        // Regular assignment
+                        const value = parseExpression();
+                        return {
+                            type: 'AssignmentExpression',
+                            name: identifier.value,
+                            value: value
+                        };
+                    }
+                }
+                
+                // Check if this is table access
+                if (current < tokens.length && 
+                    (tokens[current].type === TokenType.LEFT_BRACKET ||
+                     tokens[current].type === TokenType.DOT)) {
+                    return parseChainedTableAccess(identifier);
+                }
+                
+                // Check if this is a function call
+                if (current < tokens.length && 
+                    (tokens[current].type === TokenType.IDENTIFIER || 
+                     tokens[current].type === TokenType.NUMBER ||
+                     tokens[current].type === TokenType.STRING ||
+                     tokens[current].type === TokenType.LEFT_PAREN)) {
+                    return parseFunctionCall(identifier);
+                }
+                
+                return identifier;
+            }
+            
+            if (token.type === TokenType.FUNCTION_REF) {
+                current++; // Skip '@'
+                if (current < tokens.length && tokens[current].type === TokenType.IDENTIFIER) {
+                    const funcName = tokens[current].value;
+                    current++;
+                    return {
+                        type: 'FunctionReference',
+                        name: funcName
+                    };
+                } else {
+                    throw new Error('Expected function name after @');
+                }
+            }
 
-        if (token.type === TokenType.FUNCTION) {
-            current++;
-            let node = {
-                type: 'FunctionDeclaration',
-                name: tokens[current++].value,
-                params: [],
-                body: [],
-            };
-            while (tokens[current].type !== TokenType.RIGHT_PAREN) {
-                node.params.push(tokens[current++].value);
+            if (token.type === TokenType.WILDCARD) {
+                current++; // Skip '_'
+                return { type: 'WildcardPattern' };
             }
-            current++; // Skip right paren
-            while (tokens[current].type !== TokenType.RIGHT_BRACE) {
-                node.body.push(walk());
+
+            if (token.type === TokenType.CASE) {
+                current++; // Skip 'case'
+                
+                // Parse the value being matched
+                const value = parseExpression();
+                
+                // Expect 'of'
+                if (tokens[current].type !== TokenType.OF) {
+                    throw new Error('Expected "of" after "case"');
+                }
+                current++; // Skip 'of'
+                
+                const cases = [];
+                
+                // Parse cases until we hit a semicolon or end
+                while (current < tokens.length && tokens[current].type !== TokenType.SEMICOLON) {
+                    const pattern = parseExpression();
+                    
+                    // Expect ':' after pattern
+                    if (current < tokens.length && tokens[current].type === TokenType.ASSIGNMENT) {
+                        current++; // Skip ':'
+                    } else {
+                        throw new Error('Expected ":" after pattern in case expression');
+                    }
+                    
+                    const result = parseExpression();
+                    cases.push({ 
+                        pattern: [pattern], 
+                        result: [result] 
+                    });
+                }
+                
+                return {
+                    type: 'CaseExpression',
+                    value: [value],
+                    cases,
+                };
             }
-            current++; // Skip right brace
-            return node;
-        }
+            
 
-        if (token.type === TokenType.IDENTIFIER && tokens[current + 1].type === TokenType.LEFT_PAREN) {
-            current++;
-            let node = {
-                type: 'FunctionCall',
-                name: token.value,
-                args: [],
-            };
-            current++; // Skip left paren
-            while (tokens[current].type !== TokenType.RIGHT_PAREN) {
-                node.args.push(walk());
+            
+            // If we get here, it's an operator token that should be handled by parseExpression
+            // But we need to handle it here to avoid circular dependency
+            if (token.type === TokenType.LEFT_BRACE) {
+                current++; // Skip '{'
+                const entries = [];
+                let arrayIndex = 1;
+                
+                while (current < tokens.length && tokens[current].type !== TokenType.RIGHT_BRACE) {
+                    // Skip leading commas
+                    if (tokens[current].type === TokenType.COMMA) {
+                        current++;
+                        continue;
+                    }
+                    
+                    let key = null;
+                    let value;
+                    
+                    // Check if this is a key-value pair or just a value
+                    if (current + 1 < tokens.length && tokens[current + 1].type === TokenType.ASSIGNMENT) {
+                        // This is a key-value pair: key: value
+                        if (tokens[current].type === TokenType.IDENTIFIER) {
+                            key = {
+                                type: 'Identifier',
+                                value: tokens[current].value
+                            };
+                            current++; // Skip the key
+                        } else if (tokens[current].type === TokenType.NUMBER) {
+                            key = {
+                                type: 'NumberLiteral',
+                                value: tokens[current].value,
+                            };
+                            current++; // Skip the key
+                        } else if (tokens[current].type === TokenType.STRING) {
+                            key = {
+                                type: 'StringLiteral',
+                                value: tokens[current].value,
+                            };
+                            current++; // Skip the key
+                        } else if (tokens[current].type === TokenType.TRUE) {
+                            key = {
+                                type: 'BooleanLiteral',
+                                value: true,
+                            };
+                            current++; // Skip the key
+                        } else if (tokens[current].type === TokenType.FALSE) {
+                            key = {
+                                type: 'BooleanLiteral',
+                                value: false,
+                            };
+                            current++; // Skip the key
+                        } else {
+                            throw new Error('Invalid key type in table literal');
+                        }
+                        
+                        current++; // Skip ':'
+                        value = parseExpression();
+                    } else {
+                        // This is just a value (array-like entry)
+                        value = parseExpression();
+                    }
+                    
+                    entries.push({ key, value });
+                    
+                    // Skip trailing commas
+                    if (current < tokens.length && tokens[current].type === TokenType.COMMA) {
+                        current++;
+                    }
+                }
+                
+                if (current < tokens.length && tokens[current].type === TokenType.RIGHT_BRACE) {
+                    current++; // Skip '}'
+                    return {
+                        type: 'TableLiteral',
+                        entries: entries
+                    };
+                } else {
+                    throw new Error('Expected closing brace');
+                }
+            }
+            
+            // If we get here, it's an operator token that should be handled by parseExpression
+            // But we need to handle it here to avoid circular dependency
+            if (token.type === TokenType.PLUS ||
+                token.type === TokenType.MINUS ||
+                token.type === TokenType.MULTIPLY ||
+                token.type === TokenType.DIVIDE ||
+                token.type === TokenType.MODULO ||
+                token.type === TokenType.POWER ||
+                token.type === TokenType.EQUALS ||
+                token.type === TokenType.NOT_EQUAL ||
+                token.type === TokenType.LESS_THAN ||
+                token.type === TokenType.GREATER_THAN ||
+                token.type === TokenType.LESS_EQUAL ||
+                token.type === TokenType.GREATER_EQUAL ||
+                token.type === TokenType.AND ||
+                token.type === TokenType.OR ||
+                token.type === TokenType.XOR) {
+                // Reset current to parse the expression properly
+                return parseExpression();
             }
-            current++; // Skip right paren
-            return node;
+            
+            // If we get here, we have an unexpected token
+            throw new Error(`Unexpected token in parsePrimary: ${token.type}`);
         }
-
-        if (token.type === TokenType.SEMICOLON) {
+        
+                // Check for IO operations before calling parsePrimary
+        if (tokens[current].type === TokenType.IO_IN) {
+            current++;
+            return { type: 'IOInExpression' };
+        } else if (tokens[current].type === TokenType.IO_OUT) {
             current++;
-            return;
+            const outputValue = parseExpression();
+            return { type: 'IOOutExpression', value: outputValue };
+        } else if (tokens[current].type === TokenType.IO_ASSERT) {
+            current++;
+            const assertionExpr = parseExpression();
+            return { type: 'IOAssertExpression', value: assertionExpr };
         }
-
-        throw new TypeError(token.type);
+        
+        // Simple wrapper that calls parsePrimary for all token types
+        return parsePrimary();
     }
-
-    let ast = {
+    
+    const ast = {
         type: 'Program',
-        body: [],
+        body: []
     };
-
+    
     while (current < tokens.length) {
         const node = walk();
-        if (node !== null) {
+        if (node) {
             ast.body.push(node);
         }
+        
+        // Skip semicolons
+        if (current < tokens.length && tokens[current].type === TokenType.SEMICOLON) {
+            current++;
+        }
     }
-
+    
     return ast;
 }
 
 // Interpreter
 function interpreter(ast) {
-    let globalScope = {};
-
+    const globalScope = {};
+    initializeStandardLibrary(globalScope);
+    
     function evalNode(node) {
+        if (!node) {
+            return undefined;
+        }
         switch (node.type) {
             case 'NumberLiteral':
-                return parseInt(node.value);
+                return parseFloat(node.value);
+            case 'StringLiteral':
+                return node.value;
+            case 'BooleanLiteral':
+                return node.value;
             case 'PlusExpression':
                 return evalNode(node.left) + evalNode(node.right);
+            case 'MinusExpression':
+                return evalNode(node.left) - evalNode(node.right);
+            case 'MultiplyExpression':
+                return evalNode(node.left) * evalNode(node.right);
+            case 'DivideExpression':
+                const divisor = evalNode(node.right);
+                if (divisor === 0) {
+                    throw new Error('Division by zero');
+                }
+                return evalNode(node.left) / evalNode(node.right);
+            case 'ModuloExpression':
+                return evalNode(node.left) % evalNode(node.right);
+            case 'PowerExpression':
+                return Math.pow(evalNode(node.left), evalNode(node.right));
+            case 'EqualsExpression':
+                return evalNode(node.left) === evalNode(node.right);
+            case 'LessThanExpression':
+                return evalNode(node.left) < evalNode(node.right);
+            case 'GreaterThanExpression':
+                return evalNode(node.left) > evalNode(node.right);
+            case 'LessEqualExpression':
+                return evalNode(node.left) <= evalNode(node.right);
+            case 'GreaterEqualExpression':
+                return evalNode(node.left) >= evalNode(node.right);
+            case 'NotEqualExpression':
+                return evalNode(node.left) !== evalNode(node.right);
+            case 'AndExpression':
+                return evalNode(node.left) && evalNode(node.right);
+            case 'OrExpression':
+                return evalNode(node.left) || evalNode(node.right);
+            case 'XorExpression':
+                const leftVal = evalNode(node.left);
+                const rightVal = evalNode(node.right);
+                return (leftVal && !rightVal) || (!leftVal && rightVal);
+            case 'NotExpression':
+                return !evalNode(node.operand);
+            case 'TableLiteral':
+                const table = {};
+                let arrayIndex = 1;
+                
+                for (const entry of node.entries) {
+                    if (entry.key === null) {
+                        // Array-like entry: {1, 2, 3}
+                        table[arrayIndex] = evalNode(entry.value);
+                        arrayIndex++;
+                    } else {
+                        // Key-value entry: {name: "Alice", age: 30}
+                        let key;
+                        if (entry.key.type === 'Identifier') {
+                            // Convert identifier keys to strings
+                            key = entry.key.value;
+                        } else {
+                            // For other key types (numbers, strings), evaluate normally
+                            key = evalNode(entry.key);
+                        }
+                        const value = evalNode(entry.value);
+                        table[key] = value;
+                    }
+                }
+                
+                return table;
+            case 'TableAccess':
+                const tableValue = evalNode(node.table);
+                let keyValue;
+                
+                // Handle different key types
+                if (node.key.type === 'Identifier') {
+                    // For dot notation, use the identifier name as the key
+                    keyValue = node.key.value;
+                } else {
+                    // For bracket notation, evaluate the key expression
+                    keyValue = evalNode(node.key);
+                }
+                
+                if (typeof tableValue !== 'object' || tableValue === null) {
+                    throw new Error('Cannot access property of non-table value');
+                }
+                
+                if (tableValue[keyValue] === undefined) {
+                    throw new Error(`Key '${keyValue}' not found in table`);
+                }
+                
+                return tableValue[keyValue];
             case 'AssignmentExpression':
-                globalScope[node.name] = evalNode(node.value);
+                if (globalScope.hasOwnProperty(node.name)) {
+                    throw new Error(`Cannot reassign immutable variable: ${node.name}`);
+                }
+                const value = evalNode(node.value);
+                globalScope[node.name] = value;
                 return;
             case 'Identifier':
-                return globalScope[node.value];
-            case 'IfExpression':
-                return evalNode(node.test) ? evalNode(node.consequent) : node.alternate ? evalNode(node.alternate) : undefined;
+                const identifierValue = globalScope[node.value];
+                if (identifierValue === undefined) {
+                    throw new Error(`Variable ${node.value} is not defined`);
+                }
+                return identifierValue;
             case 'FunctionDeclaration':
-                globalScope[node.name] = function() {
+                // For anonymous functions, the name comes from the assignment
+                // The function itself doesn't have a name, so we just return
+                // The assignment will handle storing it in the global scope
+                return function(...args) {
                     let localScope = Object.create(globalScope);
                     for (let i = 0; i < node.params.length; i++) {
-                        localScope[node.params[i]] = arguments[i];
+                        localScope[node.params[i]] = args[i];
                     }
-                    let lastResult;
-                    for (let bodyNode of node.body) {
-                        lastResult = evalNode(bodyNode);
-                    }
-                    return lastResult;
+                    return localEvalNodeWithScope(node.body, localScope);
                 };
-                return;
             case 'FunctionCall':
-                if (globalScope[node.name] instanceof Function) {
+                let funcToCall; // Renamed from 'func' to avoid redeclaration
+                if (typeof node.name === 'string') {
+                    // Regular function call with string name
+                    funcToCall = globalScope[node.name];
+                } else if (node.name.type === 'Identifier') {
+                    // Function call with identifier
+                    funcToCall = globalScope[node.name.value];
+                } else if (node.name.type === 'TableAccess') {
+                    // Function call from table access (e.g., math.add)
+                    funcToCall = evalNode(node.name);
+                } else {
+                    throw new Error('Invalid function name in function call');
+                }
+                
+                if (funcToCall instanceof Function) {
                     let args = node.args.map(evalNode);
-                    return globalScope[node.name].apply(null, args);
+                    return funcToCall(...args);
+                }
+                throw new Error(`Function is not defined or is not callable`);
+            case 'CaseExpression':
+                const values = node.value.map(evalNode);
+                
+                for (const caseItem of node.cases) {
+                    const pattern = caseItem.pattern.map(evalNode);
+                    
+                    let matches = true;
+                    for (let i = 0; i < Math.max(values.length, pattern.length); i++) {
+                        const value = values[i];
+                        const patternValue = pattern[i];
+                        
+                        if (patternValue === true) continue;
+                        
+                        if (value !== patternValue) {
+                            matches = false;
+                            break;
+                        }
+                    }
+                    
+                    if (matches) {
+                        const results = caseItem.result.map(evalNode);
+                        if (results.length === 1) {
+                            return results[0];
+                        }
+                        return results.join(' ');
+                    }
+                }
+                throw new Error('No matching pattern found');
+            case 'WildcardPattern':
+                return true;
+            case 'IOInExpression':
+                const readline = require('readline');
+                const rl = readline.createInterface({
+                    input: process.stdin,
+                    output: process.stdout
+                });
+                
+                return new Promise((resolve) => {
+                    rl.question('', (input) => {
+                        rl.close();
+                        const num = parseInt(input);
+                        resolve(isNaN(num) ? input : num);
+                    });
+                });
+            case 'IOOutExpression':
+                const outputValue = evalNode(node.value);
+                console.log(outputValue);
+                return outputValue;
+            case 'IOAssertExpression':
+                const assertionValue = evalNode(node.value);
+                if (!assertionValue) {
+                    throw new Error('Assertion failed');
+                }
+                return assertionValue;
+            case 'FunctionReference':
+                const functionValue = globalScope[node.name];
+                if (functionValue === undefined) {
+                    throw new Error(`Function ${node.name} is not defined`);
                 }
-                throw new Error(`Function ${node.name} is not defined`);
+                if (typeof functionValue !== 'function') {
+                    throw new Error(`${node.name} is not a function`);
+                }
+                return functionValue;
             default:
                 throw new Error(`Unknown node type: ${node.type}`);
         }
     }
 
-    return evalNode(ast.body[0]);
+    const localEvalNodeWithScope = (node, scope) => {
+        if (!node) {
+            return undefined;
+        }
+        switch (node.type) {
+            case 'NumberLiteral':
+                return parseFloat(node.value);
+            case 'StringLiteral':
+                return node.value;
+            case 'BooleanLiteral':
+                return node.value;
+            case 'PlusExpression':
+                return localEvalNodeWithScope(node.left, scope) + localEvalNodeWithScope(node.right, scope);
+            case 'MinusExpression':
+                return localEvalNodeWithScope(node.left, scope) - localEvalNodeWithScope(node.right, scope);
+            case 'MultiplyExpression':
+                return localEvalNodeWithScope(node.left, scope) * localEvalNodeWithScope(node.right, scope);
+            case 'DivideExpression':
+                const divisor = localEvalNodeWithScope(node.right, scope);
+                if (divisor === 0) {
+                    throw new Error('Division by zero');
+                }
+                return localEvalNodeWithScope(node.left, scope) / localEvalNodeWithScope(node.right, scope);
+            case 'ModuloExpression':
+                return localEvalNodeWithScope(node.left, scope) % localEvalNodeWithScope(node.right, scope);
+            case 'PowerExpression':
+                return Math.pow(localEvalNodeWithScope(node.left, scope), localEvalNodeWithScope(node.right, scope));
+            case 'EqualsExpression':
+                return localEvalNodeWithScope(node.left, scope) === localEvalNodeWithScope(node.right, scope);
+            case 'LessThanExpression':
+                return localEvalNodeWithScope(node.left, scope) < localEvalNodeWithScope(node.right, scope);
+            case 'GreaterThanExpression':
+                return localEvalNodeWithScope(node.left, scope) > localEvalNodeWithScope(node.right, scope);
+            case 'LessEqualExpression':
+                return localEvalNodeWithScope(node.left, scope) <= localEvalNodeWithScope(node.right, scope);
+            case 'GreaterEqualExpression':
+                return localEvalNodeWithScope(node.left, scope) >= localEvalNodeWithScope(node.right, scope);
+            case 'NotEqualExpression':
+                return localEvalNodeWithScope(node.left, scope) !== localEvalNodeWithScope(node.right, scope);
+            case 'AndExpression':
+                return localEvalNodeWithScope(node.left, scope) && localEvalNodeWithScope(node.right, scope);
+            case 'OrExpression':
+                return localEvalNodeWithScope(node.left, scope) || localEvalNodeWithScope(node.right, scope);
+            case 'XorExpression':
+                const leftVal = localEvalNodeWithScope(node.left, scope);
+                const rightVal = localEvalNodeWithScope(node.right, scope);
+                return (leftVal && !rightVal) || (!leftVal && rightVal);
+            case 'NotExpression':
+                return !localEvalNodeWithScope(node.operand, scope);
+            case 'TableLiteral':
+                const table = {};
+                let arrayIndex = 1;
+                
+                for (const entry of node.entries) {
+                    if (entry.key === null) {
+                        // Array-like entry: {1, 2, 3}
+                        table[arrayIndex] = localEvalNodeWithScope(entry.value, scope);
+                        arrayIndex++;
+                    } else {
+                        // Key-value entry: {name: "Alice", age: 30}
+                        let key;
+                        if (entry.key.type === 'Identifier') {
+                            // Convert identifier keys to strings
+                            key = entry.key.value;
+                        } else {
+                            // For other key types (numbers, strings), evaluate normally
+                            key = localEvalNodeWithScope(entry.key, scope);
+                        }
+                        const value = localEvalNodeWithScope(entry.value, scope);
+                        table[key] = value;
+                    }
+                }
+                
+                return table;
+            case 'TableAccess':
+                const tableValue = localEvalNodeWithScope(node.table, scope);
+                let keyValue;
+                
+                // Handle different key types
+                if (node.key.type === 'Identifier') {
+                    // For dot notation, use the identifier name as the key
+                    keyValue = node.key.value;
+                } else {
+                    // For bracket notation, evaluate the key expression
+                    keyValue = localEvalNodeWithScope(node.key, scope);
+                }
+                
+                if (typeof tableValue !== 'object' || tableValue === null) {
+                    throw new Error('Cannot access property of non-table value');
+                }
+                
+                if (tableValue[keyValue] === undefined) {
+                    throw new Error(`Key '${keyValue}' not found in table`);
+                }
+                
+                return tableValue[keyValue];
+            case 'AssignmentExpression':
+                if (globalScope.hasOwnProperty(node.name)) {
+                    throw new Error(`Cannot reassign immutable variable: ${node.name}`);
+                }
+                globalScope[node.name] = localEvalNodeWithScope(node.value, scope);
+                return;
+            case 'Identifier':
+                // First check local scope, then global scope
+                if (scope && scope.hasOwnProperty(node.value)) {
+                    return scope[node.value];
+                }
+                const identifierValue = globalScope[node.value];
+                if (identifierValue === undefined && node.value) {
+                    return node.value;
+                }
+                return identifierValue;
+            case 'FunctionDeclaration':
+                // For anonymous functions, the name comes from the assignment
+                // The function itself doesn't have a name, so we just return
+                // The assignment will handle storing it in the global scope
+                return function(...args) {
+                    let nestedScope = Object.create(globalScope);
+                    for (let i = 0; i < node.params.length; i++) {
+                        nestedScope[node.params[i]] = args[i];
+                    }
+                    return localEvalNodeWithScope(node.body, nestedScope);
+                };
+            case 'FunctionCall':
+                let localFunc;
+                if (typeof node.name === 'string') {
+                    // Regular function call with string name
+                    localFunc = globalScope[node.name];
+                } else if (node.name.type === 'Identifier') {
+                    // Function call with identifier
+                    localFunc = globalScope[node.name.value];
+                } else if (node.name.type === 'TableAccess') {
+                    // Function call from table access (e.g., math.add)
+                    localFunc = localEvalNodeWithScope(node.name, scope);
+                } else {
+                    throw new Error('Invalid function name in function call');
+                }
+                
+                if (localFunc instanceof Function) {
+                    let args = node.args.map(arg => localEvalNodeWithScope(arg, scope));
+                    return localFunc(...args);
+                }
+                throw new Error(`Function is not defined or is not callable`);
+            case 'CaseExpression':
+                const values = node.value.map(val => localEvalNodeWithScope(val, scope));
+                
+                for (const caseItem of node.cases) {
+                    const pattern = caseItem.pattern.map(pat => localEvalNodeWithScope(pat, scope));
+                    
+                    let matches = true;
+                    for (let i = 0; i < Math.max(values.length, pattern.length); i++) {
+                        const value = values[i];
+                        const patternValue = pattern[i];
+                        
+                        if (patternValue === true) continue;
+                        
+                        if (value !== patternValue) {
+                            matches = false;
+                            break;
+                        }
+                    }
+                    
+                    if (matches) {
+                        const results = caseItem.result.map(res => localEvalNodeWithScope(res, scope));
+                        if (results.length === 1) {
+                            return results[0];
+                        }
+                        return results.join(' ');
+                    }
+                }
+                throw new Error('No matching pattern found');
+            case 'WildcardPattern':
+                return true;
+            case 'IOInExpression':
+                const readline = require('readline');
+                const rl = readline.createInterface({
+                    input: process.stdin,
+                    output: process.stdout
+                });
+                
+                return new Promise((resolve) => {
+                    rl.question('', (input) => {
+                        rl.close();
+                        const num = parseInt(input);
+                        resolve(isNaN(num) ? input : num);
+                    });
+                });
+            case 'IOOutExpression':
+                const localOutputValue = localEvalNodeWithScope(node.value, scope);
+                console.log(localOutputValue);
+                return localOutputValue;
+            case 'IOAssertExpression':
+                const localAssertionValue = localEvalNodeWithScope(node.value, scope);
+                if (!localAssertionValue) {
+                    throw new Error('Assertion failed');
+                }
+                return localAssertionValue;
+            case 'FunctionReference':
+                const localFunctionValue = globalScope[node.name];
+                if (localFunctionValue === undefined) {
+                    throw new Error(`Function ${node.name} is not defined`);
+                }
+                if (typeof localFunctionValue !== 'function') {
+                    throw new Error(`${node.name} is not a function`);
+                }
+                return localFunctionValue;
+            default:
+                throw new Error(`Unknown node type: ${node.type}`);
+        }
+    };
+
+    const localEvalNode = (node) => {
+        if (!node) {
+            return undefined;
+        }
+        switch (node.type) {
+            case 'NumberLiteral':
+                return parseFloat(node.value);
+            case 'StringLiteral':
+                return node.value;
+            case 'BooleanLiteral':
+                return node.value;
+            case 'PlusExpression':
+                return localEvalNode(node.left) + localEvalNode(node.right);
+            case 'MinusExpression':
+                return localEvalNode(node.left) - localEvalNode(node.right);
+            case 'MultiplyExpression':
+                return localEvalNode(node.left) * localEvalNode(node.right);
+            case 'DivideExpression':
+                const divisor = localEvalNode(node.right);
+                if (divisor === 0) {
+                    throw new Error('Division by zero');
+                }
+                return localEvalNode(node.left) / localEvalNode(node.right);
+            case 'ModuloExpression':
+                return localEvalNode(node.left) % localEvalNode(node.right);
+            case 'PowerExpression':
+                return Math.pow(localEvalNode(node.left), localEvalNode(node.right));
+            case 'EqualsExpression':
+                return localEvalNode(node.left) === localEvalNode(node.right);
+            case 'LessThanExpression':
+                return localEvalNode(node.left) < localEvalNode(node.right);
+            case 'GreaterThanExpression':
+                return localEvalNode(node.left) > localEvalNode(node.right);
+            case 'LessEqualExpression':
+                return localEvalNode(node.left) <= localEvalNode(node.right);
+            case 'GreaterEqualExpression':
+                return localEvalNode(node.left) >= localEvalNode(node.right);
+            case 'NotEqualExpression':
+                return localEvalNode(node.left) !== localEvalNode(node.right);
+            case 'AndExpression':
+                return localEvalNode(node.left) && localEvalNode(node.right);
+            case 'OrExpression':
+                return localEvalNode(node.left) || localEvalNode(node.right);
+            case 'XorExpression':
+                const leftVal = localEvalNode(node.left);
+                const rightVal = localEvalNode(node.right);
+                return (leftVal && !rightVal) || (!leftVal && rightVal);
+            case 'NotExpression':
+                return !localEvalNode(node.operand);
+            case 'TableLiteral':
+                const table = {};
+                let arrayIndex = 1;
+                
+                for (const entry of node.entries) {
+                    if (entry.key === null) {
+                        // Array-like entry: {1, 2, 3}
+                        table[arrayIndex] = localEvalNode(entry.value);
+                        arrayIndex++;
+                    } else {
+                        // Key-value entry: {name: "Alice", age: 30}
+                        let key;
+                        if (entry.key.type === 'Identifier') {
+                            // Convert identifier keys to strings
+                            key = entry.key.value;
+                        } else {
+                            // For other key types (numbers, strings), evaluate normally
+                            key = localEvalNode(entry.key);
+                        }
+                        const value = localEvalNode(entry.value);
+                        table[key] = value;
+                    }
+                }
+                
+                return table;
+            case 'TableAccess':
+                const tableValue = localEvalNode(node.table);
+                let keyValue;
+                
+                // Handle different key types
+                if (node.key.type === 'Identifier') {
+                    // For dot notation, use the identifier name as the key
+                    keyValue = node.key.value;
+                } else {
+                    // For bracket notation, evaluate the key expression
+                    keyValue = localEvalNode(node.key);
+                }
+                
+                if (typeof tableValue !== 'object' || tableValue === null) {
+                    throw new Error('Cannot access property of non-table value');
+                }
+                
+                if (tableValue[keyValue] === undefined) {
+                    throw new Error(`Key '${keyValue}' not found in table`);
+                }
+                
+                return tableValue[keyValue];
+            case 'AssignmentExpression':
+                if (globalScope.hasOwnProperty(node.name)) {
+                    throw new Error(`Cannot reassign immutable variable: ${node.name}`);
+                }
+                globalScope[node.name] = localEvalNode(node.value);
+                return;
+            case 'Identifier':
+                const identifierValue = globalScope[node.value];
+                if (identifierValue === undefined && node.value) {
+                    return node.value;
+                }
+                return identifierValue;
+            case 'FunctionDeclaration':
+                // For anonymous functions, the name comes from the assignment
+                // The function itself doesn't have a name, so we just return
+                // The assignment will handle storing it in the global scope
+                return function(...args) {
+                    let nestedScope = Object.create(globalScope);
+                    for (let i = 0; i < node.params.length; i++) {
+                        nestedScope[node.params[i]] = args[i];
+                    }
+                    return localEvalNodeWithScope(node.body, nestedScope);
+                };
+            case 'FunctionCall':
+                let localFunc;
+                if (typeof node.name === 'string') {
+                    // Regular function call with string name
+                    localFunc = globalScope[node.name];
+                } else if (node.name.type === 'Identifier') {
+                    // Function call with identifier
+                    localFunc = globalScope[node.name.value];
+                } else if (node.name.type === 'TableAccess') {
+                    // Function call from table access (e.g., math.add)
+                    localFunc = localEvalNode(node.name);
+                } else {
+                    throw new Error('Invalid function name in function call');
+                }
+                
+                if (localFunc instanceof Function) {
+                    let args = node.args.map(localEvalNode);
+                    return localFunc(...args);
+                }
+                throw new Error(`Function is not defined or is not callable`);
+            case 'CaseExpression':
+                const values = node.value.map(localEvalNode);
+                
+                for (const caseItem of node.cases) {
+                    const pattern = caseItem.pattern.map(localEvalNode);
+                    
+                    let matches = true;
+                    for (let i = 0; i < Math.max(values.length, pattern.length); i++) {
+                        const value = values[i];
+                        const patternValue = pattern[i];
+                        
+                        if (patternValue === true) continue;
+                        
+                        if (value !== patternValue) {
+                            matches = false;
+                            break;
+                        }
+                    }
+                    
+                    if (matches) {
+                        const results = caseItem.result.map(localEvalNode);
+                        if (results.length === 1) {
+                            return results[0];
+                        }
+                        return results.join(' ');
+                    }
+                }
+                throw new Error('No matching pattern found');
+            case 'WildcardPattern':
+                return true;
+            case 'IOInExpression':
+                const readline = require('readline');
+                const rl = readline.createInterface({
+                    input: process.stdin,
+                    output: process.stdout
+                });
+                
+                return new Promise((resolve) => {
+                    rl.question('', (input) => {
+                        rl.close();
+                        const num = parseInt(input);
+                        resolve(isNaN(num) ? input : num);
+                    });
+                });
+            case 'IOOutExpression':
+                const localOutputValue = localEvalNode(node.value);
+                console.log(localOutputValue);
+                return localOutputValue;
+            case 'IOAssertExpression':
+                const localAssertionValue = localEvalNode(node.value);
+                if (!localAssertionValue) {
+                    throw new Error('Assertion failed');
+                }
+                return localAssertionValue;
+            case 'FunctionReference':
+                const localFunctionValue = globalScope[node.name];
+                if (localFunctionValue === undefined) {
+                    throw new Error(`Function ${node.name} is not defined`);
+                }
+                if (typeof localFunctionValue !== 'function') {
+                    throw new Error(`${node.name} is not a function`);
+                }
+                return localFunctionValue;
+            default:
+                throw new Error(`Unknown node type: ${node.type}`);
+        }
+    };
+
+    let lastResult;
+    for (let node of ast.body) {
+        if (node) {
+            lastResult = evalNode(node);
+        }
+    }
+    
+    if (lastResult instanceof Promise) {
+        return lastResult.then(result => {
+            return result;
+        });
+    }
+    
+    return lastResult;
 }
 
-// Usage
-// const tokens = lexer('2 + 2');
-// const ast = parser(tokens);
-// const result = interpreter(ast);
-// console.log(result); // 4
+// Debug logging function
+function debugLog(message, data = null) {
+    if (process.env.DEBUG) {
+        console.log(`[DEBUG] ${message}`);
+        if (data) {
+            console.log(data);
+        }
+    }
+}
 
-// const tokens2 = lexer('x : 2 + 2');
-// const ast2 = parser(tokens2);
-// const result2 = interpreter(ast2);
-// console.log(result2); 
+// Debug error function
+function debugError(message, error = null) {
+    if (process.env.DEBUG) {
+        console.error(`[DEBUG ERROR] ${message}`);
+        if (error) {
+            console.error(error);
+        }
+    }
+}
 
-const fs = require('fs');
+// Execute a file
+function executeFile(filePath) {
+    try {
+        const fs = require('fs');
+        const input = fs.readFileSync(filePath, 'utf8');
+        
+        debugLog('Input:', input);
+        
+        const tokens = lexer(input);
+        debugLog('Tokens:', tokens);
+        
+        const ast = parser(tokens);
+        debugLog('AST:', JSON.stringify(ast, null, 2));
+        
+        const result = interpreter(ast);
+        
+        if (result instanceof Promise) {
+            result.then(finalResult => {
+                if (finalResult !== undefined) {
+                    console.log(finalResult);
+                }
+            }).catch(error => {
+                console.error(`Error executing file: ${error.message}`);
+            });
+        } else {
+            if (result !== undefined) {
+                console.log(result);
+            }
+        }
+    } catch (error) {
+        console.error(`Error executing file: ${error.message}`);
+    }
+}
 
-// Read the input from a file
-const input = fs.readFileSync('input.txt', 'utf-8');
+// Check command line arguments
+const args = process.argv.slice(2);
 
-// Usage
-const tokens = lexer(input);
-const ast = parser(tokens);
-const result = interpreter(ast);
-console.log(result);
\ No newline at end of file
+if (args.length === 0) {
+    console.error('Usage: node lang.js <file>');
+    console.error('  Provide a file path to execute');
+    process.exit(1);
+} else if (args.length === 1) {
+    // Execute the file
+    const filePath = args[0];
+    executeFile(filePath);
+} else {
+    // Too many arguments
+    console.error('Usage: node lang.js <file>');
+    console.error('  Provide exactly one file path to execute');
+    process.exit(1);
+}
\ No newline at end of file
diff --git a/js/scripting-lang/run_tests.sh b/js/scripting-lang/run_tests.sh
new file mode 100755
index 0000000..473f67a
--- /dev/null
+++ b/js/scripting-lang/run_tests.sh
@@ -0,0 +1,108 @@
+#!/bin/bash
+
+# Test Runner for Simple Scripting Language
+# Runs unit tests and integration tests systematically
+
+echo "=== Simple Scripting Language Test Suite ==="
+echo ""
+
+# Colors for output
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+NC='\033[0m' # No Color
+
+# Function to run a test
+run_test() {
+    local test_file=$1
+    local test_name=$2
+    
+    echo -n "Running $test_name... "
+    
+    if node lang.js "$test_file" > /dev/null 2>&1; then
+        echo -e "${GREEN}PASS${NC}"
+        return 0
+    else
+        echo -e "${RED}FAIL${NC}"
+        return 1
+    fi
+}
+
+# Function to run a test with output
+run_test_with_output() {
+    local test_file=$1
+    local test_name=$2
+    
+    echo -e "${YELLOW}=== $test_name ===${NC}"
+    node lang.js "$test_file"
+    echo ""
+}
+
+# Counters
+total_tests=0
+passed_tests=0
+failed_tests=0
+
+echo "Running Unit Tests..."
+echo "===================="
+
+# Unit tests
+unit_tests=(
+    "tests/01_lexer_basic.txt:Basic Lexer"
+    "tests/02_arithmetic_operations.txt:Arithmetic Operations"
+    "tests/03_comparison_operators.txt:Comparison Operators"
+    "tests/04_logical_operators.txt:Logical Operators"
+    "tests/05_io_operations.txt:IO Operations"
+    "tests/06_function_definitions.txt:Function Definitions"
+    "tests/07_case_expressions.txt:Case Expressions"
+    "tests/08_first_class_functions.txt:First-Class Functions"
+    "tests/09_tables.txt:Tables"
+    "tests/10_standard_library.txt:Standard Library"
+)
+
+for test in "${unit_tests[@]}"; do
+    IFS=':' read -r file name <<< "$test"
+    total_tests=$((total_tests + 1))
+    
+    if run_test "$file" "$name"; then
+        passed_tests=$((passed_tests + 1))
+    else
+        failed_tests=$((failed_tests + 1))
+    fi
+done
+
+echo ""
+echo "Running Integration Tests..."
+echo "==========================="
+
+# Integration tests
+integration_tests=(
+    "tests/integration_01_basic_features.txt:Basic Features Integration"
+    "tests/integration_02_pattern_matching.txt:Pattern Matching Integration"
+    "tests/integration_03_functional_programming.txt:Functional Programming Integration"
+)
+
+for test in "${integration_tests[@]}"; do
+    IFS=':' read -r file name <<< "$test"
+    total_tests=$((total_tests + 1))
+    
+    if run_test "$file" "$name"; then
+        passed_tests=$((passed_tests + 1))
+    else
+        failed_tests=$((failed_tests + 1))
+    fi
+done
+
+echo ""
+echo "=== Test Summary ==="
+echo "Total tests: $total_tests"
+echo -e "Passed: ${GREEN}$passed_tests${NC}"
+echo -e "Failed: ${RED}$failed_tests${NC}"
+
+if [ $failed_tests -eq 0 ]; then
+    echo -e "${GREEN}All tests passed!${NC}"
+    exit 0
+else
+    echo -e "${RED}Some tests failed.${NC}"
+    exit 1
+fi 
\ No newline at end of file
diff --git a/js/scripting-lang/table_basic_test.txt b/js/scripting-lang/table_basic_test.txt
new file mode 100644
index 0000000..172d95c
--- /dev/null
+++ b/js/scripting-lang/table_basic_test.txt
@@ -0,0 +1,51 @@
+/* Basic Table Tests */
+
+/* Test 1: Simple table creation */
+..out "=== Basic Table Tests ===";
+empty : {};
+numbers : {1, 2, 3};
+person : {name: "Alice", age: 30};
+
+..out "Empty table: ";
+..out empty;
+..out "Numbers: ";
+..out numbers;
+..out "Person: ";
+..out person;
+
+/* Test 2: Array access */
+first : numbers[1];
+second : numbers[2];
+third : numbers[3];
+
+..out "First: ";
+..out first;
+..out "Second: ";
+..out second;
+..out "Third: ";
+..out third;
+
+/* Test 3: Object access */
+name : person.name;
+age : person.age;
+
+..out "Name: ";
+..out name;
+..out "Age: ";
+..out age;
+
+/* Test 4: Mixed table */
+mixed : {1, name: "Bob", 2};
+
+first_mixed : mixed[1];
+name_mixed : mixed.name;
+second_mixed : mixed[2];
+
+..out "Mixed first: ";
+..out first_mixed;
+..out "Mixed name: ";
+..out name_mixed;
+..out "Mixed second: ";
+..out second_mixed;
+
+..out "Basic tests complete!"; 
\ No newline at end of file
diff --git a/js/scripting-lang/table_edge_cases_test.txt b/js/scripting-lang/table_edge_cases_test.txt
new file mode 100644
index 0000000..268f271
--- /dev/null
+++ b/js/scripting-lang/table_edge_cases_test.txt
@@ -0,0 +1,304 @@
+/* Table Edge Cases Tests */
+
+/* Test 1: Nested tables */
+..out "=== Test 1: Nested Tables ===";
+nested : {
+    outer: "value",
+    inner: {
+        deep: "nested",
+        numbers: {1, 2, 3}
+    }
+};
+
+outer_val : nested.outer;
+inner_table : nested.inner;
+deep_val : nested.inner.deep;
+inner_nums : nested.inner.numbers;
+first_num : nested.inner.numbers[1];
+
+..out "Outer: ";
+..out outer_val;
+..out "Inner table: ";
+..out inner_table;
+..out "Deep: ";
+..out deep_val;
+..out "Inner numbers: ";
+..out inner_nums;
+..out "First number: ";
+..out first_num;
+
+/* Test 2: Tables with different value types */
+..out "=== Test 2: Different Value Types ===";
+complex : {
+    number: 42,
+    string: "hello",
+    boolean: true,
+    array: {1, 2, 3},
+    object: {key: "value"}
+};
+
+num : complex.number;
+str : complex.string;
+bool : complex.boolean;
+arr : complex.array;
+obj : complex.object;
+
+..out "Number: ";
+..out num;
+..out "String: ";
+..out str;
+..out "Boolean: ";
+..out bool;
+..out "Array: ";
+..out arr;
+..out "Object: ";
+..out obj;
+
+/* Test 3: Tables with function references */
+..out "=== Test 3: Function References ===";
+double : x -> x * 2;
+square : x -> x * x;
+
+func_table : {
+    double_func: @double,
+    square_func: @square,
+    number: 5
+};
+
+double_ref : func_table.double_func;
+square_ref : func_table.square_func;
+table_num : func_table.number;
+
+..out "Double ref: ";
+..out double_ref;
+..out "Square ref: ";
+..out square_ref;
+..out "Table number: ";
+..out table_num;
+
+/* Test 4: Tables with arithmetic expressions */
+..out "=== Test 4: Arithmetic Expressions ===";
+math_table : {
+    sum: 5 + 3,
+    product: 4 * 6,
+    power: 2 ^ 3
+};
+
+sum_val : math_table.sum;
+prod_val : math_table.product;
+pow_val : math_table.power;
+
+..out "Sum: ";
+..out sum_val;
+..out "Product: ";
+..out prod_val;
+..out "Power: ";
+..out pow_val;
+
+/* Test 5: Tables with function calls */
+..out "=== Test 5: Function Calls ===";
+add : x y -> x + y;
+multiply : x y -> x * y;
+
+call_table : {
+    addition: add 3 4,
+    multiplication: multiply 5 6
+};
+
+add_result : call_table.addition;
+mult_result : call_table.multiplication;
+
+..out "Addition: ";
+..out add_result;
+..out "Multiplication: ";
+..out mult_result;
+
+/* Test 6: Tables with bracket notation access */
+..out "=== Test 6: Bracket Notation ===";
+bracket_test : {name: "John", age: 25};
+
+name_bracket : bracket_test["name"];
+age_bracket : bracket_test["age"];
+
+..out "Name (bracket): ";
+..out name_bracket;
+..out "Age (bracket): ";
+..out age_bracket;
+
+/* Test 7: Tables with string keys */
+..out "=== Test 7: String Keys ===";
+string_keys : {
+    "key1": "value1",
+    "key2": "value2"
+};
+
+val1 : string_keys.key1;
+val2 : string_keys["key2"];
+
+..out "Value 1: ";
+..out val1;
+..out "Value 2: ";
+..out val2;
+
+/* Test 8: Tables with numeric keys */
+..out "=== Test 8: Numeric Keys ===";
+numeric_keys : {
+    1: "one",
+    2: "two",
+    10: "ten"
+};
+
+one : numeric_keys[1];
+two : numeric_keys[2];
+ten : numeric_keys[10];
+
+..out "One: ";
+..out one;
+..out "Two: ";
+..out two;
+..out "Ten: ";
+..out ten;
+
+/* Test 9: Tables with boolean keys */
+..out "=== Test 9: Boolean Keys ===";
+bool_keys : {
+    true: "truth",
+    false: "falsehood"
+};
+
+truth : bool_keys[true];
+falsehood : bool_keys[false];
+
+..out "Truth: ";
+..out truth;
+..out "Falsehood: ";
+..out falsehood;
+
+/* Test 10: Tables with trailing commas */
+..out "=== Test 10: Trailing Commas ===";
+trailing : {
+    1,
+    2,
+    3,
+    key: "value",
+};
+
+first : trailing[1];
+second : trailing[2];
+third : trailing[3];
+key_val : trailing.key;
+
+..out "First: ";
+..out first;
+..out "Second: ";
+..out second;
+..out "Third: ";
+..out third;
+..out "Key: ";
+..out key_val;
+
+/* Test 11: Tables with leading commas */
+..out "=== Test 11: Leading Commas ===";
+leading : {
+    ,1,
+    ,2,
+    ,key: "value"
+};
+
+first_lead : leading[1];
+second_lead : leading[2];
+key_lead : leading.key;
+
+..out "First (leading): ";
+..out first_lead;
+..out "Second (leading): ";
+..out second_lead;
+..out "Key (leading): ";
+..out key_lead;
+
+/* Test 12: Tables with function definitions inside */
+..out "=== Test 12: Function Definitions Inside ===";
+func_def_table : {
+    add_func: x y -> x + y,
+    double_func: x -> x * 2,
+    name: "function_table"
+};
+
+add_func_ref : func_def_table.add_func;
+double_func_ref : func_def_table.double_func;
+func_name : func_def_table.name;
+
+..out "Add func ref: ";
+..out add_func_ref;
+..out "Double func ref: ";
+..out double_func_ref;
+..out "Func name: ";
+..out func_name;
+
+/* Test 13: Tables with case expressions inside */
+..out "=== Test 13: Case Expressions Inside ===";
+case_table : {
+    grade_func: score -> 
+        case score of
+            90 : "A"
+            80 : "B"
+            70 : "C"
+            _  : "F",
+    name: "case_table"
+};
+
+grade_func_ref : case_table.grade_func;
+case_name : case_table.name;
+
+..out "Grade func ref: ";
+..out grade_func_ref;
+..out "Case name: ";
+..out case_name;
+
+/* Test 14: Tables with standard library functions */
+..out "=== Test 14: Standard Library Functions ===";
+stdlib_table : {
+    map_func: @map,
+    compose_func: @compose,
+    pipe_func: @pipe,
+    name: "stdlib_table"
+};
+
+map_ref : stdlib_table.map_func;
+compose_ref : stdlib_table.compose_func;
+pipe_ref : stdlib_table.pipe_func;
+stdlib_name : stdlib_table.name;
+
+..out "Map ref: ";
+..out map_ref;
+..out "Compose ref: ";
+..out compose_ref;
+..out "Pipe ref: ";
+..out pipe_ref;
+..out "Stdlib name: ";
+..out stdlib_name;
+
+/* Test 15: Tables with IO operations */
+..out "=== Test 15: IO Operations ===";
+io_table : {
+    input_func: @..in,
+    output_func: @..out,
+    assert_func: @..assert,
+    name: "io_table"
+};
+
+input_ref : io_table.input_func;
+output_ref : io_table.output_func;
+assert_ref : io_table.assert_func;
+io_name : io_table.name;
+
+..out "Input ref: ";
+..out input_ref;
+..out "Output ref: ";
+..out output_ref;
+..out "Assert ref: ";
+..out assert_ref;
+..out "IO name: ";
+..out io_name;
+
+..out "Edge cases tests complete!"; 
\ No newline at end of file
diff --git a/js/scripting-lang/test.txt b/js/scripting-lang/test.txt
new file mode 100644
index 0000000..79555b0
--- /dev/null
+++ b/js/scripting-lang/test.txt
@@ -0,0 +1,730 @@
+/* ========================================
+   COMPREHENSIVE LANGUAGE TEST SUITE
+   ======================================== */
+
+..out "=== COMPREHENSIVE LANGUAGE TEST SUITE ===";
+..out "";
+
+/* ========================================
+   SECTION 1: BASIC ARITHMETIC OPERATIONS
+   ======================================== */
+
+..out "1. BASIC ARITHMETIC OPERATIONS:";
+
+/* Basic arithmetic */
+a : 10;
+b : 3;
+sum : a + b;
+diff : a - b;
+product : a * b;
+quotient : a / b;
+modulo : a % b;
+power : a ^ b;
+
+/* Assert basic arithmetic operations */
+..assert sum = 13;
+..assert diff = 7;
+..assert product = 30;
+..assert quotient = 3.3333333333333335;
+..assert modulo = 1;
+..assert power = 1000;
+
+..out "  Basic arithmetic operations verified";
+
+/* Complex arithmetic with parentheses */
+complex1 : (5 + 3) * 2;
+complex2 : ((10 - 2) * 3) + 1;
+complex3 : (2 ^ 3) % 5;
+complex4 : (15 / 3) + (7 % 4);
+
+/* Assert complex expressions */
+..assert complex1 = 16;
+..assert complex2 = 25;
+..assert complex3 = 3;
+..assert complex4 = 8;
+
+..out "  Complex arithmetic expressions verified";
+
+/* Edge cases for arithmetic */
+zero : 0;
+one : 1;
+large : 999999;
+
+zero_sum : zero + zero;
+zero_product : zero * large;
+power_zero : large ^ zero;
+power_one : large ^ one;
+modulo_zero : large % one;
+
+/* Assert arithmetic edge cases */
+..assert zero_sum = 0;
+..assert zero_product = 0;
+..assert power_zero = 1;
+..assert power_one = 999999;
+..assert modulo_zero = 0;
+
+..out "  Arithmetic edge cases verified";
+
+..out "";
+
+/* ========================================
+   SECTION 2: COMPARISON OPERATORS
+   ======================================== */
+
+..out "2. COMPARISON OPERATORS:";
+
+/* Basic comparisons */
+less : 3 < 5;
+greater : 10 > 5;
+equal : 5 = 5;
+not_equal : 3 != 5;
+less_equal : 5 <= 5;
+greater_equal : 5 >= 3;
+
+/* Assert basic comparisons */
+..assert less = true;
+..assert greater = true;
+..assert equal = true;
+..assert not_equal = true;
+..assert less_equal = true;
+..assert greater_equal = true;
+
+..out "  Basic comparison operators verified";
+
+/* Comparison edge cases */
+zero_less : 0 < 1;
+zero_equal : 0 = 0;
+zero_greater : 0 > -1;
+same_less : 5 < 5;
+same_greater : 5 > 5;
+
+/* Assert comparison edge cases */
+..assert zero_less = true;
+..assert zero_equal = true;
+..assert zero_greater = true;
+..assert same_less = false;
+..assert same_greater = false;
+
+..out "  Comparison edge cases verified";
+
+..out "";
+
+/* ========================================
+   SECTION 3: LOGICAL OPERATORS
+   ======================================== */
+
+..out "3. LOGICAL OPERATORS:";
+
+/* Basic logical operations */
+and_true : 1 and 1;
+and_false : 1 and 0;
+or_true : 0 or 1;
+or_false : 0 or 0;
+xor_true : 1 xor 0;
+xor_false : 1 xor 1;
+not_true : not 0;
+not_false : not 1;
+
+/* Assert basic logical operations */
+..assert and_true = true;
+..assert and_false = false;
+..assert or_true = true;
+..assert or_false = false;
+..assert xor_true = true;
+..assert xor_false = false;
+..assert not_true = true;
+..assert not_false = false;
+
+..out "  Basic logical operations verified";
+
+/* Complex logical expressions */
+complex_and : (5 > 3) and (10 < 20);
+complex_or : (5 < 3) or (10 > 5);
+complex_xor : (5 = 5) xor (3 = 4);
+complex_not : not (5 < 3);
+
+/* Assert complex logical expressions */
+..assert complex_and = true;
+..assert complex_or = true;
+..assert complex_xor = true;
+..assert complex_not = true;
+
+..out "  Complex logical expressions verified";
+
+..out "";
+
+/* ========================================
+   SECTION 4: VARIABLE ASSIGNMENT
+   ======================================== */
+
+..out "4. VARIABLE ASSIGNMENT:";
+
+/* Basic variable assignment */
+simple_var : 42;
+string_var : "Hello, World!";
+bool_true : true;
+bool_false : false;
+
+/* Assert basic variables */
+..assert simple_var = 42;
+..assert string_var = "Hello, World!";
+..assert bool_true = true;
+..assert bool_false = false;
+
+..out "  Basic variable assignment verified";
+
+/* Expression assignment */
+expr_var : 5 + 3 * 2;
+complex_var : (10 - 2) ^ 2;
+
+/* Assert expression variables */
+..assert expr_var = 11;
+..assert complex_var = 64;
+
+..out "  Expression variable assignment verified";
+
+..out "";
+
+/* ========================================
+   SECTION 5: FUNCTION DEFINITIONS
+   ======================================== */
+
+..out "5. FUNCTION DEFINITIONS:";
+
+/* Basic function definitions */
+add : x y -> x + y;
+multiply : x y -> x * y;
+double : x -> x * 2;
+square : x -> x * x;
+identity : x -> x;
+
+/* Function calls */
+add_result : add 3 4;
+multiply_result : multiply 5 6;
+double_result : double 8;
+square_result : square 4;
+identity_result : identity 42;
+
+/* Assert function calls */
+..assert add_result = 7;
+..assert multiply_result = 30;
+..assert double_result = 16;
+..assert square_result = 16;
+..assert identity_result = 42;
+
+..out "  Basic function definitions and calls verified";
+
+/* Function calls with complex expressions */
+complex_add : add (3 + 2) (4 + 1);
+complex_multiply : multiply (double 3) (square 2);
+nested_calls : add (add 1 2) (add 3 4);
+
+/* Assert complex function calls */
+..assert complex_add = 15;
+..assert complex_multiply = 48;
+..assert nested_calls = 10;
+
+..out "  Complex function calls verified";
+
+..out "";
+
+/* ========================================
+   SECTION 6: PATTERN MATCHING
+   ======================================== */
+
+..out "6. PATTERN MATCHING:";
+
+/* Single parameter case expressions */
+factorial : n -> 
+  case n of
+    0 : 1
+    _ : n * (factorial (n - 1));
+
+grade : score -> 
+  case score of
+    90 : "A"
+    80 : "B"
+    70 : "C"
+    _  : "F";
+
+/* Two parameter case expressions */
+compare : x y -> 
+  case x y of
+    0 0 : "both zero"
+    0 _ : "x is zero"
+    _ 0 : "y is zero"
+    _ _ : "neither zero";
+
+/* Testing pattern matching */
+fact5 : factorial 5;
+fact3 : factorial 3;
+gradeA : grade 95;
+gradeB : grade 85;
+gradeF : grade 65;
+
+compare1 : compare 0 0;
+compare2 : compare 0 5;
+compare3 : compare 5 0;
+compare4 : compare 5 5;
+
+/* Assert pattern matching results */
+..assert fact5 = 120;
+..assert fact3 = 6;
+..assert gradeA = "A";
+..assert gradeB = "B";
+..assert gradeF = "F";
+
+..assert compare1 = "both zero";
+..assert compare2 = "x is zero";
+..assert compare3 = "y is zero";
+..assert compare4 = "neither zero";
+
+..out "  Pattern matching verified";
+
+..out "";
+
+/* ========================================
+   SECTION 7: TABLES
+   ======================================== */
+
+..out "7. TABLES:";
+
+/* Empty table */
+empty : {};
+
+/* Array-like table */
+numbers : {1, 2, 3, 4, 5};
+
+/* Key-value table */
+person : {name: "Alice", age: 30, active: true};
+
+/* Mixed table */
+mixed : {1, name: "Bob", 2, active: false};
+
+/* Nested table */
+nested : {outer: {inner: "value"}};
+
+/* Table access - array style */
+first : numbers[1];
+second : numbers[2];
+last : numbers[5];
+
+/* Table access - object style */
+name : person.name;
+age : person.age;
+active : person.active;
+
+/* Table access - mixed style */
+mixed_first : mixed[1];
+mixed_name : mixed.name;
+mixed_second : mixed[2];
+
+/* Table access - nested */
+nested_value : nested.outer.inner;
+
+/* Assert table access */
+..assert first = 1;
+..assert second = 2;
+..assert last = 5;
+
+..assert name = "Alice";
+..assert age = 30;
+..assert active = true;
+
+..assert mixed_first = 1;
+..assert mixed_name = "Bob";
+..assert mixed_second = 2;
+
+..assert nested_value = "value";
+
+..out "  Table creation and access verified";
+
+/* Table edge cases */
+table_with_arithmetic : {sum: 5 + 3, product: 4 * 6};
+table_with_functions : {double: @double, square: @square};
+
+/* Assert table edge cases */
+..assert table_with_arithmetic.sum = 8;
+..assert table_with_arithmetic.product = 24;
+
+..out "  Table edge cases verified";
+
+..out "";
+
+/* ========================================
+   SECTION 8: FIRST-CLASS FUNCTIONS
+   ======================================== */
+
+..out "8. FIRST-CLASS FUNCTIONS:";
+
+/* Function references */
+double_ref : @double;
+square_ref : @square;
+add_ref : @add;
+
+/* Function composition using standard library */
+composed : compose @double @square 3;
+piped : pipe @double @square 2;
+applied : apply @double 5;
+
+/* Assert function composition */
+..assert composed = 18;
+..assert piped = 16;
+..assert applied = 10;
+
+..out "  Function composition verified";
+
+/* Function references in case expressions */
+getFunction : type -> 
+  case type of
+    "double" : @double
+    "square" : @square
+    _        : @add;
+
+func1 : getFunction "double";
+func2 : getFunction "square";
+func3 : getFunction "unknown";
+
+/* Test function references by calling them */
+test_func1 : func1 5;
+test_func2 : func2 3;
+test_func3 : func3 2 3;
+
+/* Assert function references work */
+..assert test_func1 = 10;
+..assert test_func2 = 9;
+..assert test_func3 = 5;
+
+..out "  Function references from case expressions verified";
+
+..out "";
+
+/* ========================================
+   SECTION 9: STANDARD LIBRARY
+   ======================================== */
+
+..out "9. STANDARD LIBRARY:";
+
+/* Map function */
+mapped1 : map @double 5;
+mapped2 : map @square 3;
+
+/* Filter function */
+isPositive : x -> x > 0;
+isEven : x -> x % 2 = 0;
+
+filtered1 : filter @isPositive 5;
+filtered2 : filter @isPositive -3;
+filtered3 : filter @isEven 4;
+filtered4 : filter @isEven 3;
+
+/* Reduce and Fold functions */
+reduced1 : reduce @add 0 5;
+reduced2 : reduce @multiply 1 3;
+folded1 : fold @add 0 5;
+folded2 : fold @multiply 1 3;
+
+/* Curry function */
+curried1 : curry @add 3 4;
+curried2 : curry @multiply 2 5;
+
+/* Assert standard library functions */
+..assert mapped1 = 10;
+..assert mapped2 = 9;
+
+..assert filtered1 = 5;
+..assert filtered2 = 0;
+..assert filtered3 = 4;
+..assert filtered4 = 0;
+
+..assert reduced1 = 5;
+..assert reduced2 = 3;
+..assert folded1 = 5;
+..assert folded2 = 3;
+
+..assert curried1 = 7;
+..assert curried2 = 10;
+
+..out "  Standard library functions verified";
+
+..out "";
+
+/* ========================================
+   SECTION 10: COMMENTS
+   ======================================== */
+
+..out "10. COMMENTS:";
+
+/* Single line comment */
+x : 5; /* This is a single line comment */
+
+/* Multi-line comment */
+/* This is a multi-line comment
+   that spans multiple lines
+   and should be ignored */
+
+/* Nested comments */
+/* Outer comment /* Inner comment */ More outer comment */
+
+/* Comment with code on same line */
+y : 10; /* Comment on same line */
+
+/* Assert comments are ignored */
+..assert x = 5;
+..assert y = 10;
+
+..out "  Comments work correctly - all ignored by parser";
+
+..out "";
+
+/* ========================================
+   SECTION 11: EDGE CASES AND STRESS TESTS
+   ======================================== */
+
+..out "11. EDGE CASES AND STRESS TESTS:";
+
+/* Deep nesting */
+deep_nest1 : ((((5 + 3) * 2) - 1) / 3) + 1;
+deep_nest2 : (2 ^ (3 ^ 2)) % 10;
+
+/* Complex function chains */
+complex_chain : add (multiply (double 3) (square 2)) (add 1 2);
+
+/* Multiple assignments */
+var1 : 1;
+var2 : 2;
+var3 : 3;
+var4 : 4;
+var5 : 5;
+
+sum_all : add (add (add var1 var2) (add var3 var4)) var5;
+
+/* Table with complex values */
+complex_table : {
+    arithmetic: 5 + 3 * 2,
+    function_call: double 4,
+    nested: {inner: square 3},
+    boolean: 5 > 3 and 10 < 20
+};
+
+/* Assert edge cases */
+..assert deep_nest1 = 6;
+..assert deep_nest2 = 2;
+..assert complex_chain = 27;
+..assert sum_all = 15;
+
+..assert complex_table.arithmetic = 11;
+..assert complex_table.function_call = 8;
+..assert complex_table.nested.inner = 9;
+..assert complex_table.boolean = true;
+
+..out "  Edge cases and stress tests verified";
+
+/* Recursive function stress test */
+countdown : n -> 
+  case n of
+    0 : "done"
+    _ : countdown (n - 1);
+
+count_result : countdown 3;
+
+/* Assert recursive function */
+..assert count_result = "done";
+
+..out "  Recursive function stress test verified";
+
+..out "";
+
+/* ========================================
+   SECTION 12: ASSERTIONS
+   ======================================== */
+
+..out "12. ASSERTIONS:";
+
+/* Basic assertions */
+..assert 5 = 5;
+..assert 3 < 5;
+..assert 10 > 5;
+..assert 5 <= 5;
+..assert 5 >= 3;
+..assert 3 != 5;
+
+/* Complex assertions */
+..assert (5 + 3) = 8;
+..assert (10 - 2) > 5;
+..assert (2 ^ 3) = 8;
+..assert (15 / 3) = 5;
+
+/* Function call assertions */
+..assert (add 3 4) = 7;
+..assert (double 5) = 10;
+..assert (square 3) = 9;
+
+/* Logical assertions */
+..assert 1 and 1;
+..assert 0 or 1;
+..assert 1 xor 0;
+..assert not 0;
+
+/* String assertions */
+..assert "hello" = "hello";
+..assert "world" != "hello";
+
+/* Table assertions */
+..assert numbers[1] = 1;
+..assert person.name = "Alice";
+..assert mixed[1] = 1;
+
+/* Function reference assertions */
+..assert (func1 4) = 8;
+..assert (func2 5) = 25;
+
+..out "  All assertions passed successfully!";
+
+..out "";
+
+/* ========================================
+   SECTION 13: COMPREHENSIVE INTEGRATION TEST
+   ======================================== */
+
+..out "13. COMPREHENSIVE INTEGRATION TEST:";
+
+/* Create a complex data structure */
+calculator : {
+    add: @add,
+    multiply: @multiply,
+    double: @double,
+    square: @square,
+    operations: {
+        arithmetic: {plus: "+", minus: "-", times: "*"},
+        logical: {and: "and", or: "or", not: "not"}
+    },
+    constants: {pi: 3.14159, e: 2.71828}
+};
+
+/* Use the data structure */
+calc_add : calculator.add 5 3;
+calc_mult : calculator.multiply 4 6;
+calc_double : calculator.double 7;
+calc_square : calculator.square 5;
+
+/* Complex expression using everything */
+final_result : add (calculator.double (calculator.square 3)) (calculator.multiply 2 4);
+
+/* Assert integration test results */
+..assert calc_add = 8;
+..assert calc_mult = 24;
+..assert calc_double = 14;
+..assert calc_square = 25;
+..assert final_result = 26;
+
+/* Assert nested table access */
+..assert calculator.operations.arithmetic.plus = "+";
+..assert calculator.operations.logical.and = "and";
+..assert calculator.constants.pi = 3.14159;
+
+..out "  Integration test results verified";
+
+/* Pattern matching with complex data */
+classify_number : num -> 
+  case num of
+    0 : "zero"
+    _ : case num % 2 of
+        0 : "even"
+        _ : "odd";
+
+classify1 : classify_number 0;
+classify2 : classify_number 4;
+classify3 : classify_number 7;
+
+/* Assert number classification */
+..assert classify1 = "zero";
+..assert classify2 = "even";
+..assert classify3 = "odd";
+
+..out "  Number classification verified";
+
+..out "";
+
+/* ========================================
+   SECTION 14: ERROR HANDLING AND EDGE CASES
+   ======================================== */
+
+..out "14. ERROR HANDLING AND EDGE CASES:";
+
+/* Test division by zero handling */
+/* Note: This would normally throw an error, but we'll test the assertion system */
+
+/* Test table access edge cases */
+empty_table : {};
+/* Note: Accessing non-existent keys would throw an error */
+
+/* Test function call edge cases */
+/* Note: Calling non-existent functions would throw an error */
+
+/* Test immutable variable reassignment */
+test_var : 42;
+/* Note: Attempting to reassign would throw an error */
+
+..out "  Error handling edge cases noted";
+
+..out "";
+
+/* ========================================
+   SECTION 15: PERFORMANCE AND SCALE TESTS
+   ======================================== */
+
+..out "15. PERFORMANCE AND SCALE TESTS:";
+
+/* Test large arithmetic expressions */
+large_expr : (((((1 + 2) * 3) + 4) * 5) + 6) * 7;
+..assert large_expr = 287;
+
+/* Test nested function calls */
+nested_func : add (add (add 1 2) (add 3 4)) (add (add 5 6) (add 7 8));
+..assert nested_func = 36;
+
+/* Test complex table structures */
+complex_nested_table : {
+    level1: {
+        level2: {
+            level3: {
+                value: 42,
+                computed: 5 + 3 * 2
+            }
+        }
+    }
+};
+
+..assert complex_nested_table.level1.level2.level3.value = 42;
+..assert complex_nested_table.level1.level2.level3.computed = 11;
+
+..out "  Performance and scale tests verified";
+
+..out "";
+
+/* ========================================
+   FINAL SUMMARY
+   ======================================== */
+
+..out "=== TEST SUITE COMPLETED SUCCESSFULLY ===";
+..out "";
+..out "All language features tested and verified:";
+..out "  Arithmetic operations (+, -, *, /, %, ^)";
+..out "  Comparison operators (=, <, >, <=, >=, !=)";
+..out "  Logical operators (and, or, xor, not)";
+..out "  Variable assignment";
+..out "  Function definitions and calls";
+..out "  Pattern matching with case expressions";
+..out "  Tables (arrays and objects)";
+..out "  First-class functions and composition";
+..out "  Standard library functions";
+..out "  Comments (single-line, multi-line, nested)";
+..out "  Input/Output operations";
+..out "  Assertions";
+..out "  Edge cases and stress tests";
+..out "  Complex integration scenarios";
+..out "  Error handling edge cases";
+..out "  Performance and scale tests";
+..out "";
+..out "Language implementation is fully functional and verified!"; 
\ No newline at end of file
diff --git a/js/scripting-lang/tests/01_lexer_basic.txt b/js/scripting-lang/tests/01_lexer_basic.txt
new file mode 100644
index 0000000..bdf7397
--- /dev/null
+++ b/js/scripting-lang/tests/01_lexer_basic.txt
@@ -0,0 +1,25 @@
+/* Unit Test: Basic Lexer Functionality */
+/* Tests: Numbers, identifiers, operators, keywords */
+
+/* Test numbers */
+x : 42;
+y : 3.14;
+z : 0;
+
+/* Test identifiers */
+name : "test";
+flag : true;
+value : false;
+
+/* Test basic operators */
+sum : x + y;
+diff : x - y;
+prod : x * y;
+quot : x / y;
+
+/* Test keywords */
+result : case x of
+    42 : "correct"
+    _ : "wrong";
+
+..out "Lexer basic test completed"; 
\ No newline at end of file
diff --git a/js/scripting-lang/tests/02_arithmetic_operations.txt b/js/scripting-lang/tests/02_arithmetic_operations.txt
new file mode 100644
index 0000000..9c6ab37
--- /dev/null
+++ b/js/scripting-lang/tests/02_arithmetic_operations.txt
@@ -0,0 +1,31 @@
+/* Unit Test: Arithmetic Operations */
+/* Tests: All arithmetic operators and precedence */
+
+/* Basic arithmetic */
+a : 10;
+b : 3;
+sum : a + b;
+diff : a - b;
+product : a * b;
+quotient : a / b;
+modulo : a % b;
+power : a ^ b;
+
+/* Test results */
+..assert sum = 13;
+..assert diff = 7;
+..assert product = 30;
+..assert quotient = 3.3333333333333335;
+..assert modulo = 1;
+..assert power = 1000;
+
+/* Complex expressions with parentheses */
+complex1 : (5 + 3) * 2;
+complex2 : ((10 - 2) * 3) + 1;
+complex3 : (2 ^ 3) % 5;
+
+..assert complex1 = 16;
+..assert complex2 = 25;
+..assert complex3 = 3;
+
+..out "Arithmetic operations test completed"; 
\ No newline at end of file
diff --git a/js/scripting-lang/tests/03_comparison_operators.txt b/js/scripting-lang/tests/03_comparison_operators.txt
new file mode 100644
index 0000000..f122a84
--- /dev/null
+++ b/js/scripting-lang/tests/03_comparison_operators.txt
@@ -0,0 +1,33 @@
+/* Unit Test: Comparison Operators */
+/* Tests: All comparison operators */
+
+/* Basic comparisons */
+less : 3 < 5;
+greater : 10 > 5;
+equal : 5 = 5;
+not_equal : 3 != 5;
+less_equal : 5 <= 5;
+greater_equal : 5 >= 3;
+
+/* Test results */
+..assert less = true;
+..assert greater = true;
+..assert equal = true;
+..assert not_equal = true;
+..assert less_equal = true;
+..assert greater_equal = true;
+
+/* Edge cases */
+zero_less : 0 < 1;
+zero_equal : 0 = 0;
+zero_greater : 0 > -1;
+same_less : 5 < 5;
+same_greater : 5 > 5;
+
+..assert zero_less = true;
+..assert zero_equal = true;
+..assert zero_greater = true;
+..assert same_less = false;
+..assert same_greater = false;
+
+..out "Comparison operators test completed"; 
\ No newline at end of file
diff --git a/js/scripting-lang/tests/04_logical_operators.txt b/js/scripting-lang/tests/04_logical_operators.txt
new file mode 100644
index 0000000..591e04b
--- /dev/null
+++ b/js/scripting-lang/tests/04_logical_operators.txt
@@ -0,0 +1,35 @@
+/* Unit Test: Logical Operators */
+/* Tests: All logical operators */
+
+/* Basic logical operations */
+and_true : 1 and 1;
+and_false : 1 and 0;
+or_true : 0 or 1;
+or_false : 0 or 0;
+xor_true : 1 xor 0;
+xor_false : 1 xor 1;
+not_true : not 0;
+not_false : not 1;
+
+/* Test results */
+..assert and_true = true;
+..assert and_false = false;
+..assert or_true = true;
+..assert or_false = false;
+..assert xor_true = true;
+..assert xor_false = false;
+..assert not_true = true;
+..assert not_false = false;
+
+/* Complex logical expressions */
+complex1 : 1 and 1 and 1;
+complex2 : 1 or 0 or 0;
+complex3 : not (1 and 0);
+complex4 : (1 and 1) or (0 and 1);
+
+..assert complex1 = true;
+..assert complex2 = true;
+..assert complex3 = true;
+..assert complex4 = true;
+
+..out "Logical operators test completed"; 
\ No newline at end of file
diff --git a/js/scripting-lang/tests/05_io_operations.txt b/js/scripting-lang/tests/05_io_operations.txt
new file mode 100644
index 0000000..a16bf94
--- /dev/null
+++ b/js/scripting-lang/tests/05_io_operations.txt
@@ -0,0 +1,28 @@
+/* Unit Test: IO Operations */
+/* Tests: ..out, ..assert operations */
+
+/* Test basic output */
+..out "Testing IO operations";
+
+/* Test assertions */
+x : 5;
+y : 3;
+sum : x + y;
+
+..assert x = 5;
+..assert y = 3;
+..assert sum = 8;
+..assert x > 3;
+..assert y < 10;
+..assert sum != 0;
+
+/* Test string comparisons */
+..assert "hello" = "hello";
+..assert "world" != "hello";
+
+/* Test complex assertions */
+..assert (x + y) = 8;
+..assert (x * y) = 15;
+..assert (x > y) = true;
+
+..out "IO operations test completed"; 
\ No newline at end of file
diff --git a/js/scripting-lang/tests/06_function_definitions.txt b/js/scripting-lang/tests/06_function_definitions.txt
new file mode 100644
index 0000000..3bd3eee
--- /dev/null
+++ b/js/scripting-lang/tests/06_function_definitions.txt
@@ -0,0 +1,32 @@
+/* Unit Test: Function Definitions */
+/* Tests: Function syntax, parameters, calls */
+
+/* Basic function definitions */
+add : x y -> x + y;
+multiply : x y -> x * y;
+double : x -> x * 2;
+square : x -> x * x;
+identity : x -> x;
+
+/* Test function calls */
+result1 : add 3 4;
+result2 : multiply 5 6;
+result3 : double 8;
+result4 : square 4;
+result5 : identity 42;
+
+/* Test results */
+..assert result1 = 7;
+..assert result2 = 30;
+..assert result3 = 16;
+..assert result4 = 16;
+..assert result5 = 42;
+
+/* Test function calls with parentheses */
+result6 : add (3 + 2) (4 + 1);
+result7 : multiply (double 3) (square 2);
+
+..assert result6 = 15;
+..assert result7 = 24;
+
+..out "Function definitions test completed"; 
\ No newline at end of file
diff --git a/js/scripting-lang/tests/07_case_expressions.txt b/js/scripting-lang/tests/07_case_expressions.txt
new file mode 100644
index 0000000..d0ed2fe
--- /dev/null
+++ b/js/scripting-lang/tests/07_case_expressions.txt
@@ -0,0 +1,47 @@
+/* Unit Test: Case Expressions */
+/* Tests: Pattern matching, wildcards, nested cases */
+
+/* Basic case expressions */
+factorial : n -> 
+  case n of
+    0 : 1
+    _ : n * (factorial (n - 1));
+
+grade : score -> 
+  case score of
+    90 : "A"
+    80 : "B"
+    70 : "C"
+    _  : "F";
+
+/* Test case expressions */
+fact5 : factorial 5;
+grade1 : grade 95;
+grade2 : grade 85;
+grade3 : grade 65;
+
+/* Test results */
+..assert fact5 = 120;
+..assert grade1 = "A";
+..assert grade2 = "B";
+..assert grade3 = "F";
+
+/* Multi-parameter case expressions */
+compare : x y -> 
+  case x y of
+    0 0 : "both zero"
+    0 _ : "x is zero"
+    _ 0 : "y is zero"
+    _ _ : "neither zero";
+
+test1 : compare 0 0;
+test2 : compare 0 5;
+test3 : compare 5 0;
+test4 : compare 5 5;
+
+..assert test1 = "both zero";
+..assert test2 = "x is zero";
+..assert test3 = "y is zero";
+..assert test4 = "neither zero";
+
+..out "Case expressions test completed"; 
\ No newline at end of file
diff --git a/js/scripting-lang/tests/08_first_class_functions.txt b/js/scripting-lang/tests/08_first_class_functions.txt
new file mode 100644
index 0000000..f228ccd
--- /dev/null
+++ b/js/scripting-lang/tests/08_first_class_functions.txt
@@ -0,0 +1,51 @@
+/* Unit Test: First-Class Functions */
+/* Tests: Function references, higher-order functions */
+
+/* Basic functions */
+double : x -> x * 2;
+square : x -> x * x;
+add1 : x -> x + 1;
+
+/* Function references */
+double_ref : @double;
+square_ref : @square;
+add1_ref : @add1;
+
+/* Test function references */
+result1 : double_ref 5;
+result2 : square_ref 3;
+result3 : add1_ref 10;
+
+..assert result1 = 10;
+..assert result2 = 9;
+..assert result3 = 11;
+
+/* Higher-order functions using standard library */
+composed : compose @double @square 3;
+piped : pipe @double @square 2;
+applied : apply @double 7;
+
+..assert composed = 18;
+..assert piped = 16;
+..assert applied = 14;
+
+/* Function references in case expressions */
+getFunction : type -> 
+  case type of
+    "double" : @double
+    "square" : @square
+    _        : @add1;
+
+func1 : getFunction "double";
+func2 : getFunction "square";
+func3 : getFunction "unknown";
+
+result4 : func1 4;
+result5 : func2 4;
+result6 : func3 4;
+
+..assert result4 = 8;
+..assert result5 = 16;
+..assert result6 = 5;
+
+..out "First-class functions test completed"; 
\ No newline at end of file
diff --git a/js/scripting-lang/tests/09_tables.txt b/js/scripting-lang/tests/09_tables.txt
new file mode 100644
index 0000000..3845903
--- /dev/null
+++ b/js/scripting-lang/tests/09_tables.txt
@@ -0,0 +1,50 @@
+/* Unit Test: Tables */
+/* Tests: Table literals, access, mixed types */
+
+/* Empty table */
+empty : {};
+
+/* Array-like table */
+numbers : {1, 2, 3, 4, 5};
+
+/* Key-value table */
+person : {name: "Alice", age: 30, active: true};
+
+/* Mixed table */
+mixed : {1, name: "Bob", 2, active: false};
+
+/* Test array access */
+first : numbers[1];
+second : numbers[2];
+last : numbers[5];
+
+..assert first = 1;
+..assert second = 2;
+..assert last = 5;
+
+/* Test object access */
+name : person.name;
+age : person.age;
+active : person.active;
+
+..assert name = "Alice";
+..assert age = 30;
+..assert active = true;
+
+/* Test mixed table access */
+first_mixed : mixed[1];
+name_mixed : mixed.name;
+second_mixed : mixed[2];
+
+..assert first_mixed = 1;
+..assert name_mixed = "Bob";
+..assert second_mixed = 2;
+
+/* Test bracket notation */
+name_bracket : person["name"];
+age_bracket : person["age"];
+
+..assert name_bracket = "Alice";
+..assert age_bracket = 30;
+
+..out "Tables test completed"; 
\ No newline at end of file
diff --git a/js/scripting-lang/tests/10_standard_library.txt b/js/scripting-lang/tests/10_standard_library.txt
new file mode 100644
index 0000000..222b005
--- /dev/null
+++ b/js/scripting-lang/tests/10_standard_library.txt
@@ -0,0 +1,47 @@
+/* Unit Test: Standard Library */
+/* Tests: All built-in higher-order functions */
+
+/* Basic functions for testing */
+double : x -> x * 2;
+square : x -> x * x;
+add : x y -> x + y;
+isPositive : x -> x > 0;
+
+/* Map function */
+mapped1 : map @double 5;
+mapped2 : map @square 3;
+
+..assert mapped1 = 10;
+..assert mapped2 = 9;
+
+/* Compose function */
+composed : compose @double @square 3;
+..assert composed = 18;
+
+/* Pipe function */
+piped : pipe @double @square 2;
+..assert piped = 16;
+
+/* Apply function */
+applied : apply @double 7;
+..assert applied = 14;
+
+/* Filter function */
+filtered1 : filter @isPositive 5;
+filtered2 : filter @isPositive -3;
+
+..assert filtered1 = 5;
+..assert filtered2 = 0;
+
+/* Reduce and Fold functions */
+reduced : reduce @add 0 5;
+folded : fold @add 0 5;
+
+..assert reduced = 5;
+..assert folded = 5;
+
+/* Curry function */
+curried : curry @add 3 4;
+..assert curried = 7;
+
+..out "Standard library test completed"; 
\ No newline at end of file
diff --git a/js/scripting-lang/tests/integration_01_basic_features.txt b/js/scripting-lang/tests/integration_01_basic_features.txt
new file mode 100644
index 0000000..cb215ab
--- /dev/null
+++ b/js/scripting-lang/tests/integration_01_basic_features.txt
@@ -0,0 +1,37 @@
+/* Integration Test: Basic Language Features */
+/* Combines: arithmetic, comparisons, functions, IO */
+
+..out "=== Integration Test: Basic Features ===";
+
+/* Define utility functions */
+add : x y -> x + y;
+multiply : x y -> x * y;
+isEven : x -> x % 2 = 0;
+isPositive : x -> x > 0;
+
+/* Test arithmetic with functions */
+sum : add 10 5;
+product : multiply 4 6;
+doubled : multiply 2 sum;
+
+..assert sum = 15;
+..assert product = 24;
+..assert doubled = 30;
+
+/* Test comparisons with functions */
+even_test : isEven 8;
+odd_test : isEven 7;
+positive_test : isPositive 5;
+negative_test : isPositive -3;
+
+..assert even_test = true;
+..assert odd_test = false;
+..assert positive_test = true;
+..assert negative_test = false;
+
+/* Test complex expressions */
+complex : add (multiply 3 4) (isEven 10 and isPositive 5);
+
+..assert complex = 13;
+
+..out "Basic features integration test completed"; 
\ No newline at end of file
diff --git a/js/scripting-lang/tests/integration_02_pattern_matching.txt b/js/scripting-lang/tests/integration_02_pattern_matching.txt
new file mode 100644
index 0000000..f0b969a
--- /dev/null
+++ b/js/scripting-lang/tests/integration_02_pattern_matching.txt
@@ -0,0 +1,64 @@
+/* Integration Test: Pattern Matching */
+/* Combines: case expressions, functions, recursion, complex patterns */
+
+..out "=== Integration Test: Pattern Matching ===";
+
+/* Recursive factorial with case expressions */
+factorial : n -> 
+  case n of
+    0 : 1
+    _ : n * (factorial (n - 1));
+
+/* Pattern matching with multiple parameters */
+classify : x y -> 
+  case x y of
+    0 0 : "both zero"
+    0 _ : "x is zero"
+    _ 0 : "y is zero"
+    _ _ : case x of
+            0 : "x is zero (nested)"
+            _ : case y of
+                  0 : "y is zero (nested)"
+                  _ : "neither zero";
+
+/* Test factorial */
+fact5 : factorial 5;
+fact3 : factorial 3;
+
+..assert fact5 = 120;
+..assert fact3 = 6;
+
+/* Test classification */
+test1 : classify 0 0;
+test2 : classify 0 5;
+test3 : classify 5 0;
+test4 : classify 5 5;
+
+..assert test1 = "both zero";
+..assert test2 = "x is zero";
+..assert test3 = "y is zero";
+..assert test4 = "neither zero";
+
+/* Complex nested case expressions */
+analyze : x y z -> 
+  case x y z of
+    0 0 0 : "all zero"
+    0 0 _ : "x and y zero"
+    0 _ 0 : "x and z zero"
+    _ 0 0 : "y and z zero"
+    0 _ _ : "only x zero"
+    _ 0 _ : "only y zero"
+    _ _ 0 : "only z zero"
+    _ _ _ : "none zero";
+
+result1 : analyze 0 0 0;
+result2 : analyze 0 1 1;
+result3 : analyze 1 0 1;
+result4 : analyze 1 1 1;
+
+..assert result1 = "all zero";
+..assert result2 = "only x zero";
+..assert result3 = "only y zero";
+..assert result4 = "none zero";
+
+..out "Pattern matching integration test completed"; 
\ No newline at end of file
diff --git a/js/scripting-lang/tests/integration_03_functional_programming.txt b/js/scripting-lang/tests/integration_03_functional_programming.txt
new file mode 100644
index 0000000..d0c6682
--- /dev/null
+++ b/js/scripting-lang/tests/integration_03_functional_programming.txt
@@ -0,0 +1,67 @@
+/* Integration Test: Functional Programming */
+/* Combines: first-class functions, higher-order functions, composition */
+
+..out "=== Integration Test: Functional Programming ===";
+
+/* Basic functions */
+double : x -> x * 2;
+square : x -> x * x;
+add1 : x -> x + 1;
+isEven : x -> x % 2 = 0;
+
+/* Function composition */
+composed1 : compose @double @square 3;
+composed2 : compose @square @double 2;
+composed3 : compose @add1 @double 5;
+
+..assert composed1 = 18;
+..assert composed2 = 16;
+..assert composed3 = 11;
+
+/* Function piping */
+piped1 : pipe @double @square 3;
+piped2 : pipe @square @double 2;
+piped3 : pipe @add1 @double 5;
+
+..assert piped1 = 36;
+..assert piped2 = 8;
+..assert piped3 = 11;
+
+/* Function application */
+applied1 : apply @double 7;
+applied2 : apply @square 4;
+applied3 : apply @add1 10;
+
+..assert applied1 = 14;
+..assert applied2 = 16;
+..assert applied3 = 11;
+
+/* Function selection with case expressions */
+getOperation : type -> 
+  case type of
+    "double" : @double
+    "square" : @square
+    "add1"   : @add1
+    _        : @identity;
+
+/* Test function selection */
+op1 : getOperation "double";
+op2 : getOperation "square";
+op3 : getOperation "add1";
+op4 : getOperation "unknown";
+
+result1 : op1 5;
+result2 : op2 4;
+result3 : op3 7;
+result4 : op4 3;
+
+..assert result1 = 10;
+..assert result2 = 16;
+..assert result3 = 8;
+..assert result4 = 3;
+
+/* Complex functional composition */
+complex : compose @double (compose @square @add1) 3;
+..assert complex = 32;
+
+..out "Functional programming integration test completed"; 
\ No newline at end of file
diff --git a/js/seed/README.md b/js/seed/README.md
index 8159cb3..981ca7d 100644
--- a/js/seed/README.md
+++ b/js/seed/README.md
@@ -1,6 +1,6 @@
 # Seed: Minimal FRP/TEA Web App Starter Kit
 
-This is an opinionated, minimal starting point for browser-native web apps using a functional, Elm-style architecture (FRP/TEA) and only browser APIs. No frameworks, no build step, just ES modules.
+This is an opinionated, hopefully simple starting point for browser-native web apps using a functional, Elm-style architecture (FRP/TEA) and only browser APIs. No rulers, no kings, no frameworks, no build step, only ES modules.
 
 ## Architecture
 - **state.js**: App state definition and helpers
@@ -15,14 +15,9 @@ This is an opinionated, minimal starting point for browser-native web apps using
 - **View**: Pure function `(state) => html`
 - **Entrypoint**: Handles events, dispatches actions, triggers re-render
 
-## Why?
-- Simple, testable, and maintainable
-- No dependencies
-- Encourages functional, declarative code
-
 ## How to Extend and Use This Template
 
-This template is designed to be a flexible, opinionated starting point for any browser-native app.
+This template is designed to be a flexible, opinionated starting point for any kinda app, especially proofs of concept, toys, and prototypes.
 
 ### Key Files to Extend
 - **src/state.js**: Define the app's state shape and any helper functions for cloning or initializing state.
@@ -69,9 +64,9 @@ Suppose you want to add a button that increments a counter:
      ```
 
 ### Tips
-- Keep all state transitions in `update.js` for predictability.
-- Keep all DOM rendering in `view.js` for clarity.
-- Use the `postRender` hook for accessibility or focus management.
+- Keep all state transitions in `update.js`.
+- Keep all DOM rendering in `view.js`.
+- Use the `postRender` hook for accessibility or focus management stuff.
 - Add new features by extending state, update, view, and wiring up events in `app.js`.
 
 ---
diff --git a/js/seed/seed b/js/seed/seed
new file mode 100755
index 0000000..15276e7
--- /dev/null
+++ b/js/seed/seed
@@ -0,0 +1,75 @@
+#!/bin/bash
+
+set -euo pipefail
+
+# Usage: seed plant
+
+if [ "$#" -ne 1 ] || [ "$1" != "plant" ]; then
+  echo "Usage: $0 plant"
+  exit 1
+fi
+
+if [ "$EUID" -eq 0 ]; then
+  echo "Do not run this script as root."
+  exit 1
+fi
+
+if ! command -v git >/dev/null 2>&1; then
+  echo "Warning: git is not installed. You won't be able to initialize a git repo."
+fi
+
+SRC_DIR="$(cd "$(dirname "$0")" && pwd)"
+
+read -rp "Enter new project name: " DEST_DIR
+
+if [ -z "$DEST_DIR" ]; then
+  echo "Project name cannot be empty."
+  exit 1
+fi
+
+DEST_PATH="$PWD/$DEST_DIR"
+
+if [ -e "$DEST_PATH" ]; then
+  echo "Error: '$DEST_PATH' already exists."
+  exit 1
+fi
+
+cleanup() {
+  if [ -d "$DEST_PATH" ]; then
+    echo "Cleaning up partial directory..."
+    rm -rf "$DEST_PATH"
+  fi
+}
+trap cleanup INT TERM
+
+echo "Copying seed template to '$DEST_PATH'..."
+mkdir "$DEST_PATH"
+
+if command -v rsync >/dev/null 2>&1; then
+  rsync -a --exclude='.git' --exclude='seed' "$SRC_DIR/" "$DEST_PATH/"
+else
+  cp -r "$SRC_DIR/"* "$DEST_PATH/"
+  cp -r "$SRC_DIR/".* "$DEST_PATH/" 2>/dev/null || true
+  rm -rf "$DEST_PATH/.git" "$DEST_PATH/seed"
+fi
+
+cd "$DEST_PATH"
+
+# Optionally, update README
+if [ -f README.md ]; then
+  sed -i '' "1s/.*/# $DEST_DIR/" README.md 2>/dev/null || sed -i "1s/.*/# $DEST_DIR/" README.md
+fi
+
+echo "Initialized new project in '$DEST_PATH'."
+
+read -rp "Do you want to initialize a git repository? (y/n): " INIT_GIT
+if [[ "$INIT_GIT" =~ ^[Yy]$ ]]; then
+  git init
+  echo "Git repository initialized."
+else
+  echo "Skipping git initialization."
+fi
+
+echo "Next steps:"
+echo "  cd \"$DEST_PATH\""
+echo "  and tend to the seed you've planted..." 
\ No newline at end of file
diff --git a/js/seed/src/app.js b/js/seed/src/app.js
index 34b4579..49ad9d1 100644
--- a/js/seed/src/app.js
+++ b/js/seed/src/app.js
@@ -155,11 +155,3 @@ function setHistoryPointer(idx) {
     updateHistoryInfo();
   }
 }
-
-function handleSliderChange(e) {
-  setHistoryPointer(Number(e.target.value));
-}
-
-function handleStepperChange(e) {
-  setHistoryPointer(Number(e.target.value));
-} 
\ No newline at end of file
diff --git a/js/seed/src/dev.js b/js/seed/src/dev.js
index ee1a6e7..173fc3c 100644
--- a/js/seed/src/dev.js
+++ b/js/seed/src/dev.js
@@ -1,8 +1,8 @@
 // devMode.js
-// Minimal, single-file dev mode with scriptable console API
+// Simpleish, single-file dev mode with interactive console API
 
 /**
- * Initialize dev mode: exposes a scriptable API for stepping through state history.
+ * Initialize dev mode: exposes an API for stepping through state history.
  * @param {object} opts
  * @param {function} opts.getState - returns current app state
  * @param {function} opts.setState - sets app state
diff --git a/js/seed/src/view.js b/js/seed/src/view.js
index 5feef6e..4c6e680 100644
--- a/js/seed/src/view.js
+++ b/js/seed/src/view.js
@@ -4,10 +4,10 @@
 /**
  * Pure view functions for the application.
  *
- * Why pure functions returning HTML strings?
+ * Why pure functions returning HTML strings? Because Elm does it, tbh.
  * - Keeps rendering logic stateless and easy to test.
- * - Ensures the UI is always a direct function of state, avoiding UI bugs from incremental DOM updates.
- * - Using template literals is minimal and browser-native, with no dependencies.
+ * - Ensures the UI is always a direct function of state, which should in theory totally avoid bugs from incremental DOM updates.
+ * - Using template literals is minimal and browser-native, with no dependencies, and is fun.
  *
  * Why escape output?
  * - Prevents XSS and ensures all user/content data is safely rendered.