Think Javascript Promises as promise you makes in real life. Like you promise your friend to buy a coffee, they don't have coffee now but they have guarantee you will apear with a fresh coffee or a come back with excuse to why cafe was closed.

In code promise help use to manage tasks which takes time like fetching data from server or leading heavy image wihout freezing the entire code while we waiting.

Content List

What Problem Promises Solve

Promise States (Pending, Fulfilled, Rejected)

Basic Promise Lifecycle

Handling Success and Failure

Promise Chaining Concept

What Problem Promises Solve

Before promises javascript used callbacks to perform tasks. If you need to do three taks depends on each other like logic user, fetch user profile, fetch user posts then you would end up nesting function inside funciton inside function.

This creates infamous callback hell also known as pyramid of doom .…