Async JS
summary
Explains how callbacks, promises, generators and async/await map to the JS runtime and shows working code with setTimeout, fetch and Promise.resolve to demonstrate ordering. Claims that promises go to the microtask queue (higher priority) while timers and DOM handlers go to the callback queue, so resolved promises run before delayed callbacks; shows a blocking synchronous loop delaying callbacks but not microtasks. Uses concrete examples and they behave as described.
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chapters (8)
- 0:00Async JavaScript intro
- 1:29JS single-threaded model
- 6:52Callback problems
- 7:13Promises improve async
- 13:54Event loop queues
- 14:35Iterators and generators
- 19:53Async/await readability
- 22:22Summary
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