code: function arrayFrom(arrayLike) {
  	if (Array.from) {
  		return Array.from(arrayLike);
  	}
  	var array = [];
  	for (var i = 0; i < arrayLike.length; i++) {
  		array[i] = arrayLike[i];
  	}
  	return array;
  }
docs: Array.from or a simple shim for non-supporting browsers
  
  @param  {{length: number}} arrayLike
  @return {array}