Ik-12 Chubko Mykhailo labwork6 Tasks 1 to 2

Exercises/1-pipe.js

@@ -1,5 +1,15 @@
 'use strict';
 
-const pipe = (...fns) => (x) => null;
+const pipe = (...fns) => x => {
+
+    for (const fn of fns) {
+      if (typeof fn !== 'function') {
+        throw new Error('All arguments must be functions');
+      }
+    }
+
+
+    return fns.reduce((v, fn) => fn(v), x);
+  };
 
 module.exports = { pipe };

Exercises/2-compose.js

@@ -1,5 +1,31 @@
 'use strict';
 
-const compose = (...fns) => (x) => null;
+const compose = (...fns) => {
+  const eventHandlers = {};
+  const composedFn = (x) => {
+    if (fns.length === 0) return x;
+    let result = x;
+    try {
+      for (let i = fns.length - 1; i >= 0; i--) {
+        result = fns[i](result);
+      }
+    } catch (error) {
+      if (eventHandlers.error) {
+        eventHandlers.error.forEach(handler => handler(error));
+      }
+      return undefined;
+    }
+    return result;
+  };
+
+  composedFn.on = (eventType, handler) => {
+    if (!eventHandlers[eventType]) {
+      eventHandlers[eventType] = [];
+    }
+    eventHandlers[eventType].push(handler);
+  };
+
+  return composedFn;
+};
 
 module.exports = { compose };