Implement throttle function

Throttle ensures a function runs at most once per time period:

function throttle(func, limit) {
  let inThrottle = false;

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

// Usage - scroll handler runs at most every 100ms
window.addEventListener('scroll', throttle(() => {
  console.log('Scroll position:', window.scrollY);
}, 100));

Throttle vs Debounce

Throttle	Debounce
Runs at regular intervals	Runs after user stops
Good for: scroll, resize	Good for: search input
"At most once per X ms"	"Wait X ms after last call"