Debounce

/** @function
 * @name debounce
 * @description Utility method for debouncing the resize event
 * @param {function} func
 * @param {number} wait
 * @param {object} immediate
 * @example var myEfficientFn = debounce(function() { things to do }, 250);
 * @example  window.addEventListener( 'resize', myEfficientFn );
 */

var debounce = function ( func, wait, immediate ) {

  var timeout;
  return function() {

    var context = this;
    var args = arguments;

    var later = function() {
      timeout = null;
      if ( ! immediate ) {
        func.apply( context, args );
      }
    };
    var callNow = immediate && !timeout;

    window.clearTimeout( timeout );
    timeout = window.setTimeout( later, wait );

    if ( callNow ) {
      func.apply( context, args );
    }

  };
};