Throttle limits the rate at which a function can fire. It can only be invoked once during the limit time window. It is a different control compared to debounce.

throttle.js

function throttle(func, limit) {
  let lastFunc;
  let lastRan;
  return function(...args) {
    if (!lastRan) {
      func.apply(this, args)
      lastRan = Date.now();
    } else {
      clearTimeout(lastFunc)
      lastFunc = setTimeout(() => {
        if ((Date.now() - lastRan) >= limit) {
          func.apply(this, args)
          lastRan = Date.now()
        }
      }, limit - (Date.now() - lastRan))
    }
  }
}

// The message, 'Function is actually invoked', will be printed at most once for every 5 seconds during the browser window resizing.
window.addEventListener('resize', throttle(()=>console.log('Function is actually invoked'), 5000));
console.log('Throttle will be called');