Actually Understanding Asynchronous JavaScript
summary
Explains why JavaScript appears asynchronous but relies on the environment (browser/Node) and the call stack and event loop interaction, lays out the three run‑to‑completion rules, and demonstrates concrete tools: raw XMLHttpRequest callbacks refactored into Promises, wrapping callbacks with new Promise, using Promise.all, and async/await (promises + generators). Shows practical fixes: breaking a 10k–1M loop with timers to keep UI responsive, use requestAnimationFrame for smooth animation, and notes alert blocks the queue.
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chapters (12)
- 0:00Start
- 6:57Asynchronous Javascript Is Based on Events
- 7:31How Does Synchronous Code Work
- 7:41The Call Stack
- 8:24Call Stack
- 10:13Event Queue
- 12:40Behavior Object Model
- 13:27Set Timeout
- 15:12Infinite Loops
- 17:43Callback Pattern
- 19:08Error Callback
- 21:57Chaining Promises
