update

tutorials/delay.js

@@ -0,0 +1,12 @@
+/*
+    The built-in function setTimeout uses callbacks. Create a promise-based alternative.
+    The function delay(ms) should return a promise. That promise should resolve after ms milliseconds, so that we can add .then to it, like this:
+*/
+
+function delay(ms){
+    return new Promise(resolve => {
+        setTimeout(resolve, ms);
+    });
+}
+
+delay(1000).then(() => console.log("Hello world!"));