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27. Memory Management & GC Internals

Mark-and-sweep, memory leaks, and profiling.

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JavaScript engines use Mark-and-Sweep garbage collection. Objects that cannot be reached from GC roots are reclaimed. Memory leaks occur when unused objects remain referenced.

js
// Detach listeners to prevent memory leaks
window.removeEventListener("scroll", handler);

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  1. 1. What garbage collection algorithm is standard in modern JS engines?

  2. 2. What causes a common client-side memory leak?

  3. 3. What tool is used to inspect memory allocation in browsers?

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