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This beginner tutorial explains how JavaScript Promises improve asynchronous code compared with callbacks. It covers Promise states, creation and use, chaining, error handling, finally, and a fetch-based example.
Syllabus
Intro.
Async vs. Sync.
The problem with Async.
Convert to Callback.
Convert to Promises.
Different phases of a Promise.
How to use a Promise.
Why do we like Promises?.
Chaining.
Benefits of Promises over Callbacks.
Error handling, REJECT and .catch().
.finally().
Real world example with fetch().
Summary.
Next....
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