Week 9: Understanding Asynchronous JavaScript

Asynchronous JavaScript Week 9 was about understanding how JavaScript handles asynchronous operations. Callbacks, promises, async/await, and the event loop. Callbacks and the Event Loop The breakthrough. Understanding how JavaScript's call stack works with the event loop. JavaScript is single-threaded, but the event loop makes it feel concurrent. Learned why setTimeout doesn't guarantee exact timing, how asynchronous operations don't block execution, and how the call stack, web APIs, and callback queue work together. Callback hell showed why we need better solutions. Nested callbacks three levels deep become unreadable pyramids of doom. Promises Promises flatten callback hell into readable chains. Creating promises with resolve and reject, chaining with then and catch, handling errors properly. Promise.all runs multiple operations in parallel and waits for all to complete. Promise.race returns whichever finishes first. Async/Await Async/await changed everything. Same asynchronous code,