JavaScript VM internals, EventLoop, Async and ScopeChains
summary
Explains that JavaScript does a two-phase compile+execute so declarations hoist, shows how function calls allocate heap execution contexts with a lexical backpointer, and demonstrates closure = function + scope chain where returned functions keep their outer heap alive because GC is by reachability not reference count. Uses browser/node Web APIs plus a Philip Roberts sPrima visualization to show event loop pulls callbacks from queues, replaces a blocking forEach with setTimeout callbacks, and proves async generators and queued callbacks keep the UI responsive.
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chapters (9)
- 0:00Introduction
- 0:58What makes programming interesting
- 5:40Agenda
- 10:05Execution
- 15:45Variable shadowing
- 23:18Closure
- 24:03What is Closure
- 26:23Demo
- 37:03Question
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