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-# Function Dispatch & Functional Programming Implementation Plan
-
-## Overview
-
-This document outlines the plan to implement function dispatch and functional programming features in the `rawk` language, addressing the current limitations in the `README.md`.
-
-## Current State Analysis
-
-### ✅ What's Working
-- **Direct Function Calls**: Functions work perfectly when called directly
-- **Dispatch Table**: Correctly built with function metadata (`RAWK_DISPATCH`)
-- **Function Compilation**: All rawk functions compile to internal `__lambda_X` functions
-- **Standard Library**: All predicate and array utility functions working
-
-### ❌ What's Not Working
-- **Function Dispatch**: `dispatch_call()` just prints error messages
-- **Functional Programming**: No `map()`, `reduce()`, `pipe()` implementation
-- **Dynamic Function Calls**: Can't call functions by string name
-
-## Implementation Strategy
-
-### Phase 1: Function Dispatch Implementation
-
-#### Current Dispatch Table Format
-```
-RAWK_DISPATCH["add"] = "__lambda_0|2|1"
-RAWK_DISPATCH["multiply"] = "__lambda_1|2|2"
-```
-
-#### Approach: Switch Statement Dispatch
-
-**Why This Approach:**
-- **Portable**: Works in all AWK implementations
-- **Fast**: Direct function calls, no string evaluation
-- **Debuggable**: Clear error messages and stack traces
-- **Extensible**: Easy to add new functions
-
-**Implementation:**
-```awk
-function dispatch_call(func_name, arg1, arg2, arg3, arg4, arg5) {
-    if (!(func_name in RAWK_DISPATCH)) {
-        print "Error: Function '" func_name "' not found" > "/dev/stderr"
-        return
-    }
-    
-    metadata = RAWK_DISPATCH[func_name]
-    split(metadata, parts, "|")
-    internal_name = parts[1]
-    arg_count = parts[2]
-    
-    # Switch statement approach
-    if (internal_name == "__lambda_0") {
-        if (arg_count == 2) return __lambda_0(arg1, arg2)
-        if (arg_count == 1) return __lambda_0(arg1)
-        if (arg_count == 0) return __lambda_0()
-    } else if (internal_name == "__lambda_1") {
-        if (arg_count == 2) return __lambda_1(arg1, arg2)
-        if (arg_count == 1) return __lambda_1(arg1)
-        if (arg_count == 0) return __lambda_1()
-    }
-    # ... etc for all functions
-    
-    print "Error: Invalid argument count for function '" func_name "'" > "/dev/stderr"
-}
-```
-
-### Phase 2: Functional Programming Implementation
-
-#### `map()` Function
-```awk
-function map(func_name, array, result, i, count) {
-    count = 0
-    for (i in array) {
-        count++
-        result[count] = dispatch_call(func_name, array[i])
-    }
-    return count
-}
-```
-
-**Usage:**
-```rawk
-$double = (x) -> x * 2;
-$numbers = [1, 2, 3, 4, 5];
-$doubled = map("double", numbers);
-```
-
-#### `reduce()` Function
-```awk
-function reduce(func_name, array, initial, result, i, first) {
-    result = initial
-    first = 1
-    for (i in array) {
-        if (first) {
-            result = array[i]
-            first = 0
-        } else {
-            result = dispatch_call(func_name, result, array[i])
-        }
-    }
-    return result
-}
-```
-
-**Usage:**
-```rawk
-$add = (x, y) -> x + y;
-$numbers = [1, 2, 3, 4, 5];
-$sum = reduce("add", numbers);
-```
-
-#### `pipe()` Function
-```awk
-function pipe(value, func_names, result, i) {
-    result = value
-    for (i = 1; i <= length(func_names); i++) {
-        result = dispatch_call(func_names[i], result)
-    }
-    return result
-}
-```
-
-**Usage:**
-```rawk
-$double = (x) -> x * 2;
-$add_one = (x) -> x + 1;
-$result = pipe(5, ["double", "add_one"]);  # Result: 11
-```
-
-### Phase 3: Advanced Features
-
-#### Function Composition
-```awk
-function compose(func1, func2, value) {
-    return dispatch_call(func1, dispatch_call(func2, value))
-}
-```
-
-#### Partial Application
-```awk
-function partial(func_name, fixed_args, result, i) {
-    # Store partial function in a special format
-    result = "PARTIAL:" func_name
-    for (i = 1; i <= length(fixed_args); i++) {
-        result = result "|" fixed_args[i]
-    }
-    return result
-}
-```
-
-## Implementation Steps
-
-### Step 1: Modify Compiler
-- Update `rawk.awk` to generate switch statements in `dispatch_call()`
-- Ensure all function metadata is correctly captured
-- Add error handling for invalid function calls
-
-### Step 2: Test Dispatch Mechanism
-- Create tests for `dispatch_call()` with various function signatures
-- Verify error handling for non-existent functions
-- Test argument count validation
-
-### Step 3: Implement Functional Functions
-- Add `map()`, `reduce()`, `pipe()` to standard library
-- Create comprehensive tests for each function
-- Handle edge cases (empty arrays, single elements, etc.)
-
-### Step 4: Integration Testing
-- Test functional programming features with real-world examples
-- Verify performance and correctness
-- Update documentation and examples
-
-## Technical Challenges & Solutions
-
-### Challenge 1: AWK Array Limitations
-**Problem**: AWK doesn't support returning arrays from functions
-**Solution**: Use pass-by-reference pattern with `get_keys()` and `get_values()`
-
-### Challenge 2: Dynamic Function Calls
-**Problem**: AWK doesn't have `@` operator for dynamic function calls
-**Solution**: Use switch statement approach with pre-generated dispatch logic
-
-### Challenge 3: Function Metadata
-**Problem**: Need to track function signatures and argument counts
-**Solution**: Extend dispatch table to include argument count and function type
-
-## Testing Strategy
-
-### Unit Tests
-- Test each functional function in isolation
-- Test dispatch mechanism with various function signatures
-- Test error conditions and edge cases
-
-### Integration Tests
-- Test functional programming with real data
-- Test performance with large arrays
-- Test compatibility with existing rawk features
-
-### Example Test Cases
-```rawk
-# Test map function
-$square = (x) -> x * x;
-$numbers = [1, 2, 3, 4, 5];
-$squared = map("square", numbers);
-expect_equal(squared[1], 1);
-expect_equal(squared[2], 4);
-expect_equal(squared[3], 9);
-
-# Test reduce function
-$add = (x, y) -> x + y;
-$sum = reduce("add", numbers);
-expect_equal(sum, 15);
-
-# Test pipe function
-$double = (x) -> x * 2;
-$add_one = (x) -> x + 1;
-$result = pipe(5, ["double", "add_one"]);
-expect_equal(result, 11);
-```
-
-## Success Criteria
-
-- [ ] `dispatch_call()` works for all rawk functions
-- [ ] `map()` function correctly applies functions to arrays
-- [ ] `reduce()` function correctly reduces arrays with functions
-- [ ] `pipe()` function correctly chains function calls
-- [ ] All existing tests continue to pass
-- [ ] Performance is acceptable for typical use cases
-- [ ] Documentation is updated with examples
-
-## Future Enhancements
-
-### Phase 4: Advanced Functional Features
-- **Currying**: Automatic partial application
-- **Memoization**: Cache function results
-- **Lazy Evaluation**: Defer computation until needed
-- **Higher-Order Functions**: Functions that return functions
-
-### Phase 5: Performance Optimizations
-- **Compile-time Optimization**: Inline simple functions
-- **JIT Compilation**: Generate optimized AWK code
-- **Memory Management**: Efficient array handling
-
-## Conclusion
-
-This plan provides a clear path to implementing functional programming features in rawk while maintaining compatibility with existing code and AWK's limitations. The switch statement approach offers the best balance of performance, portability, and maintainability. 
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