1 files changed, 63 insertions, 0 deletions
diff --git a/js/match.js b/js/match.js
new file mode 100644
index 0000000..ae13124
--- /dev/null
+++ b/js/match.js
@@ -0,0 +1,63 @@
+// naive pattern matching
+const match = (value, ...patterns) => {
+    for (let [pattern, action] of patterns) {
+        if (pattern === value || (typeof pattern === 'function' && pattern(value))) {
+        return action(value);
+        }
+    }
+    throw new Error("No match found");
+}
+
+
+const isNumber = x => typeof x === 'number';
+const isString = x => typeof x === 'string';
+
+const result = match(
+  42,
+  [1, () => "one"],
+  [2, () => "two"],
+  [isNumber, x => `number: ${x}`],
+  [isString, x => `string: ${x}`]
+);
+
+console.log(result);
+
+
+
+// slightly fancier pattern matching
+const matchObject = (value, ...patterns) => {
+    for (let [pattern, action] of patterns) {
+        if (typeof pattern === 'function' && pattern(value)) {
+            return action(value);
+        } else if (typeof pattern === 'object' && pattern !== null) {
+            let isMatch = true;
+            for (let key in pattern) {
+                if (pattern[key] !== value[key]) {
+                isMatch = false;
+                break;
+                }
+            }
+            if (isMatch) return action(value);
+        } else if (pattern === value) {
+            return action(value);
+        }
+    }
+    throw new Error("No match found");
+}
+
+const isAdult = person => person.age >= 18;
+const isChild = person => person.age < 18;
+
+const personResult = matchObject(
+  { name: 'Rachel', age: 30 },
+  [{ name: 'Rachel', age: 30 }, () => "Rachel, 30 years old"],
+  [isAdult, person => `${person.name} is an adult`],
+  [isChild, person => `${person.name} is a child`]
+);
+
+console.log(personResult); 
+
+
+// Basic Matching: Checking if a value directly matches a pattern.
+// Function Patterns: Uses functions to define more complex matching logic.
+// Object Patterns: Match objects based on their properties.
\ No newline at end of file