zignd · January 23, 2017 21:15 · Feb 8, 2015
diff --git a/1-sleep-es7.js b/1-sleep-es7.js
@@ -0,0 +1,10 @@
+// ES7, async/await
+function sleep(ms = 0) {
+  return new Promise(r => setTimeout(r, ms));
+}
+
+(async () => {
+  console.log('a');
+  await sleep(1000);
+  console.log('b');
+})()
diff --git a/2-sleep-es6-promise.js b/2-sleep-es6-promise.js
@@ -0,0 +1,21 @@
+// ES6, native Promises, arrow functions, default arguments
+function sleep(ms = 0) {
+  return new Promise(r => setTimeout(r, ms));
+}
+
+console.log('a');
+sleep(1000).then(() => {
+  console.log('b');
+});
+
+// or if we were to be strictly identical, an "async" function returns a
+// Promise, so this is more accurate, but the fluff isn't needed for in this case
+
+(function() {
+  return new Promise((resolve, reject) => {
+    sleep(1000).then(() => {
+      console.log('b');
+      resolve();
+    });
+  });
+})();
diff --git a/3-sleep-es6-just-promise.js b/3-sleep-es6-just-promise.js
@@ -0,0 +1,14 @@
+// ES6, native Promises ONLY
+function sleep(ms) {
+  ms = ms || 0;
+  return new Promise(function(resolve) {
+    setTimeout(resolve, ms);
+  });
+}
+
+(function() {
+  console.log('a');
+  sleep(1000).then(function() {
+    console.log('b');
+  });
+})();
diff --git a/4-sleep-es5.js b/4-sleep-es5.js
@@ -0,0 +1,12 @@
+// ES5, nothing special
+function sleep(ms, callback) {
+  ms = ms || 0;
+  setTimeout(callback, ms);
+}
+
+(function() {
+  console.log('a');
+  sleep(1000, function() {
+    console.log('b');
+  });
+})();
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