Throttle Implementation

Limit function execution to once per time interval.

Code

JavaScript

function throttle(fn, limit) {
  let inThrottle;
  return function (...args) {
    if (!inThrottle) {
      fn.apply(this, args);
      inThrottle = true;
      setTimeout(() => (inThrottle = false), limit);
    }
  };
}

const throttledScroll = throttle(() => console.log("scroll"), 1000);

Line-by-line explanation

1.inThrottle tracks whether we're in the cooldown period.
2.If not throttled, run the function immediately.
3.Set inThrottle to true and reset after limit ms.
4.Subsequent calls within limit are ignored.

Expected output

scroll (once per second)

Related snippets

Debounce Implementation Event Delegation