Question 1

How do you implement debounce and throttle from scratch?

Accepted Answer

Debounce: function debounce(fn, delay) { let timer; return function(...args) { clearTimeout(timer); timer = setTimeout(() => fn.apply(this, args), delay); }; }. Throttle: function throttle(fn, delay) { let last = 0; return function(...args) { const now = Date.now(); if (now - last >= delay) { last = now; fn.apply(this, args); } }; }.

Question 2

What is the difference between debounce and throttle (Walmart question)?

Accepted Answer

Debounce delays execution until activity stops (only the last call runs, after a delay). Throttle limits to once per interval (executes at a fixed rate, ignoring calls in between).

Question 3

When would you use debounce vs throttle in a real application?

Accepted Answer

Debounce for search input (300ms), auto-save (1000ms), form validation (500ms). Throttle for scroll (100ms), mousemove (50ms), rapid button clicks (500ms). Debounce after activity stops; throttle during activity.

Question 4

Can you combine debounce and throttle in JavaScript?

Accepted Answer

Yes. A hybrid approach: throttle during activity (rate-limited) plus a trailing debounce call (ensures the last call runs). Some lodash implementations offer this as the default throttle behavior.

How do you implement debounce and throttle from scratch?

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