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Lesson 4: Implementing Promises for Asynchronous JavaScript
Technologies: JavaScript

Lesson Description
JavaScript Promises simplify asynchronous programming and help you avoid using callbacks. In this lesson you learn to create a new promise. You learn to use the then(), catch(), and finally() methods. You also see how to chain several promise together and to rewrite the setTimeout() function as a promise.

Contents
Lesson Objectives 00:00
Promises in JavaScript 00:19
Using the Promise Constructor in JavaScript 00:45
DEMO: Use a Promise Constructor in JavaScript 01:29
Use Two Promise Callbacks in JavaScript 03:30
DEMO: Pass Two Callbacks to Promise Constructor in JavaScript 03:56
Using the catch() Method in JavaScript 05:16
DEMO: Using the catch() Method for Error Handling in JavaScript 05:47
The Promise Finally Method in JavaScript 07:14
DEMO: The Promise finally() Method Always Runs in JavaScript 07:43
Promise Chaining in JavaScript 08:34
DEMO: Chain Promises Together in JavaScript 08:58
DEMO: Chain Promises with Different Timeouts in JavaScript 10:01
DEMO: Chaining Promises with a catch() in JavaScript 11:26
DEMO: Rewrite setTimeout() as a Promise in JavaScript 13:05
Lesson Summary 14:44

Helpful Links
Samples and hands-on labs for this course: https://www.pdsa.com/YouTube

JavaScript
https://developer.mozilla.org/en-US/d...

Asynchronous Programming in JavaScript
https://developer.mozilla.org/en-US/d...

https://developer.mozilla.org/en-US/d...

JavaScript Promises
https://developer.mozilla.org/en-US/d...

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Paul.About()
Hello, my name is Paul D. Sheriff and I have a passion for teaching. I have been training developers for over 35 years through books, videos, article, blog posts, and international conferences and user groups.

Paul.Contact()
Website: https://www.pdsa.com
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