dalaidunc · August 25, 2017 15:23 · Aug 25, 2017
diff --git a/asyncForEach.js b/asyncForEach.js
@@ -0,0 +1,18 @@
+// extend the Array prototype with an asyncForEach method
+Array.prototype.asyncForEach = async function (fn) {
+  for (let i = 0; i < this.length; i++) {
+    await fn(this[i], i);
+  }
+};
+
+const arr = ['a', 'b', 'c', 'd'];
+
+// define a Promise wrapper around the setTimeout function
+function wait (fn, time) {
+  return new Promise(resolve => setTimeout(() => {fn();resolve();}, time));
+}
+
+// call an asynchronous function upon each element in the array
+arr.asyncForEach(async (item, index) => {
+  await wait(() => console.log(item), 500);
+});