debounce-2019.js

// Inspired by @desandro's debounce.js https://gist.github.com/desandro/8559356
// Inspired by @ChrisFerdinandi's article: https://gomakethings.com/debouncing-events-with-requestanimationframe-for-better-performance/
function debounce( fn ) {
  var timeout;
  
  return function debounced() {
    var _this = this,
        args  = arguments;

    // If there's a timer, cancel it
    if (timeout) {
      window.cancelAnimationFrame(timeout);
    }

    // Setup the new requestAnimationFrame()
    timeout = window.requestAnimationFrame(function () {
      fn.apply( _this, args );
    });
  }
}