js_flashcards_memory

Question 1

What is memory management in JS?

Answer 1

Allocation/deallocation of memory resources. Automated in JS.

Question 2

What is garbage collection (GC)?

Answer 2

Automatic reclaiming of unused memory.

Question 3

Explain mark-and-sweep GC.

Answer 3

Marks reachable objects, reclaims unmarked memory. Handles circular refs.

Question 4

Common sources of memory leaks?

Answer 4

Globals, forgotten timers, closures, detached DOM, circular refs.

Question 5

Prevent leaks from timers/listeners?

Answer 5

Clear timers, remove event listeners when done.

Question 6

What is memory profiling?

Answer 6

Use dev tools to analyze memory usage and leaks.

Question 7

What are WeakMap and WeakSet?

Answer 7

Collections with weak references, allowing GC of unused objects.

Question 8

How does requestAnimationFrame help memory?

Answer 8

Schedules animations efficiently, reduces repaints and memory use.