Master JavaScript Promise For Interviews (Callback hell, Async Await) | JS Promise - Part 1
In this video, you’ll learn JavaScript Promises from the ground up. We’ll understand why Promises were introduced, how they solve Callback Hell, and how methods like then(), catch() work behind the scenes.
Whether you’re a beginner learning asynchronous JavaScript or preparing for frontend interviews, this tutorial will help you build a solid understanding of Promises with simple examples and visual explanations.
⏱️ Timestamps
00:00 Intro – What is a JavaScript Promise?
00:29 Creating a simple Promise (resolve example)
01:47 Why do we even need Promises?
01:59 The callback hell problem (nested callbacks example)
04:38 Refactoring callback hell using Promises
08:17 Handling errors with .catch()
08:48 Simple Promise example with .then()
10:49 Sync vs async: proving executor code runs synchronously
13:31 Promise states: pending, fulfilled, rejected
15:06 Promise with setTimeout (pending state demo)
16:32 Using async/await with Promises
18:04 Two awaited Promises running concurrently (timer behavior)
21:10 Key insight: Promise executor runs at creation, not at await
23:36 Wrap-up & what's next (generators, iterators, async-await)
📚 Topics Covered
Asynchronous JavaScript
Callback Hell
Promise Basics
Promise States
resolve() and reject()
then(), catch()
Promise Chaining
Error Handling
Internal Working of Promises
JavaScript Interview Preparation
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