Callbacks, Promises, Async Await | JavaScript Fetch API Explained

Learn about Callbacks, Promises, and Async Await as the JavaScript Fetch API is explained in this tutorial. You will also learn about thenables and how async / await replaces them in our JS code. The first 30 minutes covers the concepts. The last 30 minutes gives examples of retrieving data from different APIs with Fetch.

▶ This video is part of the JavaScript Tutorials for Beginners Playlist found here:    • Javascript Tutorials for Beginners  

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✅ Quick Concepts outline:
Fetch API with Async / Await
(0:00) Intro
(0:29) What is a callback function?
(1:15) What is the problem with callbacks?
(3:00) JavaScript Promises have 3 states
(5:28) A promise may not return a value where you expect it to: You need to wait for a promise to resolve
(6:58) Using thenables with a promise
(20:15) An easy mistake to make with promises
(24:00) Creating an async function
(25:00) Applying await inside the function
(33:45) Example 1: Retrieving user data
(40:00) Example 2: Retrieving dad jokes
(47:00) Example 3: Posting data
(49:40) Example 4: Retrieving data with URL parameters
(54:55) Abstract it all into single responsibility functions

🤖 APIs used in the examples for this tutorial:
• https://jsonplaceholder.typicode.com/
• https://icanhazdadjoke.com/
• https://httpbin.org/
• http://www.icndb.com/api/

📚 Further Reading:
MDN Web Docs:
Using Fetch: https://developer.mozilla.org/en-US/d...
Making asynchronous programming easier with async and await: https://developer.mozilla.org/en-US/d...
The Promise Object: https://developer.mozilla.org/en-US/d...
Thenables: https://developer.mozilla.org/en-US/d...
Eloquent JavaScript, Chapter 11: https://eloquentjavascript.net/11_asy...

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