Minature debounce borrowed and tweaked from vue-js-tips

debounce.js

// https://github.com/vuejs-tips/tiny-debounce/blob/master/index.js
function debounce(fn, delay) {
  let timeoutID = null;
  return (...args) => {
    clearTimeout(timeoutID);
    timeoutID = setTimeout(() => {
      fn(...args)
    }, delay);
  }
}