These are the topics for week 2:

1. JavaScript Versions
2. Promises
   • Callback Hell
   • ES6 Update
3. Fetch API
4. Thinking Like a Programmer III

You are undoubtably different than when you were a baby. Back then you couldn't really do much: crying, laughing and taking dumps. That's pretty much it. But as the years past you increasingly could do more and more: walking, socializing or playing an instrument.

Likewise, so has JavaScript evolved. Back in

• The Weird History of JavaScript

By now you should've had some practice using callbacks. To reiterate, we use callbacks as a way to create asynchronicity in our application: we want to enable our application to do multiple things simultaneously.

But what if you want to have multiple

• Callback Hell

This is where Promises come in. The concept of a Promise, in execution, doesn't add anything new. It does exactly what callbacks aim to do, which is enabling asynchronous actions: for example, clicking a button to load in an image, while still being able to navigate the webpage.

What

So, in effect, you could call Promises the updated version of callbacks. Callbacks version 2.0.

• A Simple Guide to ES6 Promises
• Promises

Last week you learned about making API calls. For repetition's sake

• Fetch() - Working with Data and APIs in JavaScript

Are you finished with going through the materials? High five! If you feel ready to get practical, click here.