function composition solution

Author: CemWebDev

easy/function-composition.js

@@ -2,11 +2,12 @@
  * @param {Function[]} functions
  * @return {Function}
  */
-var compose = function (functions) {
-  return function (x) {};
-};
 
-/**
- * const fn = compose([x => x + 1, x => 2 * x])
- * fn(4) // 9
- */
+const compose = (functions) => {
+  return function (x) {
+    for (let i = functions.length - 1; i >= 0; i--) {
+      x = functions[i](x);
+    }
+    return x;
+  };
+};