Implement a Debounce Function

JavaScript

Technical Specification

Implement a debounce function that delays invoking a callback until after a certain wait time has elapsed since the last call.

Input/Output Samples

Input:debounce(fn, 300)

Output:fn runs only once after user stops triggering for 300ms

Optimal Logic Path

function debounce(fn, delay) {
  let timer;
  return function (...args) {
    clearTimeout(timer);
    timer = setTimeout(() => fn.apply(this, args), delay);
  };
}

Architectural Deep-Dive

debounce returns a wrapper that resets the timer on every call. The original function only runs when no new calls arrive within the delay.