Javascript Event Debounce (Run function X only once after Y ms)

debounce-fxn.js

function debounce(fn, delay) {
  var timer = null;
  return function () {
    var context = this, args = arguments;
    clearTimeout(timer);
    timer = setTimeout(function () {
      fn.apply(context, args);
    }, delay);
  };
}

Example Usage:

document.addEventListener('mousemove', debounce(function (event) {
  console.log('tick');
}, 1000));