The answer
Walmart asks candidates to explain the difference between debouncing and throttling, implement both from scratch, and explain when to use each. They may also ask you to implement a specific use case (e.g., throttle a scroll handler).
Debouncing vs Throttling in JavaScript
What is the Walmart interview question about debounce and throttle?
More FAQs in Debouncing vs Throttling in JavaScript
Debounce delays execution until activity stops (only the last call runs). Throttle limits to once per interval (calls at a fixed rate, ignoring calls in between). Debounce = wait then run; throttle = run at most every N ms.
Use debounce for search input, auto-save, and window resize (run after activity stops). Use throttle for scroll, mousemove, and continuous events (run at a controlled rate, not after stopping).
function debounce(fn, delay) { let timer; return function(...args) { clearTimeout(timer); timer = setTimeout(() => fn.apply(this, args), delay); }; }. Each call clears and resets the timer. Only the last call executes.
Still have questions?
Browse all our FAQs or reach out to our support team
Want to upskill yourself?
Your learning library
Small steps. Big possibilities.
Find your next course. Build something great.