Debounce + Throttle

debounce2019.js

export function debounce (fn, time) {
  let timeout;

  return function() {
    const functionCall = () => fn.apply(this, arguments);
    
    clearTimeout(timeout);
    timeout = setTimeout(functionCall, time);
  }
}

export function throttled (delay, fn) {
  let lastCall = 0;
  return function (...args) {
    const now = (new Date).getTime();
    if (now - lastCall < delay) {
      return;
    }
    lastCall = now;
    return fn(...args);
  }
}