Trash Talk - Understanding Memory Management
summary
Explains how Node.js and Google's V8 manage memory with a mark-and-sweep garbage collector that uses the generational hypothesis (frequent collection of short‑lived objects, promotion of survivors), contrasts that with reference counting and its cycle problem, and shows common leaks: accidental globals, closures holding large arrays, long‑running timers, and detached DOM nodes. Demonstrates diagnosis with heap snapshots in Chrome DevTools, and fixes using WeakMap/WeakSet and FinalizationRegistry plus deterministic cleanup.
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chapters (11)
- 0:00Introduction to talk
- 0:24Garbage collection basics
- 2:52Memory life cycle stages
- 7:07Undecidable problems in GC
- 9:56Reference counting vs mark-sweep
- 12:27V8 garbage collection
- 15:20Common memory leaks
- 18:55Heap snapshots for debugging
- 20:19Weak maps and sets
- 22:47Finalization registry
- 23:10Best practices summary
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