Tutorial / Module 5

Asynchronous JavaScript

Callbacks, promises from scratch, async/await, error handling, and the event loop that powers it all.

5.1 JavaScript Callbacks and the Pre-Promise Era: Why Async Needed Promises Read 5.2 Build a JavaScript Promise from Scratch: How `then`, Chaining, and Microtasks Actually Work Read 5.3 JavaScript async/await Explained: How It Really Works (and How to Use It Well) Read 5.4 JavaScript Error Handling Patterns: try/catch, Result Types, and async/await Read 5.5 The JavaScript Event Loop, Microtasks vs Macrotasks (with Timing Examples) Read 5.6 JavaScript Execution Context and the Call Stack: The Mental Model You Need Read

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