ES6 versions of popular curried functions

debounce-and-throttle.js

function debounce(fn, delay) {
  let timer;

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

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