_each vs http://draw2d.org/draw2d_touch/jsdoc_5/source/ArrayList.html#draw2d-util-ArrayList-method-each

gistfile1.txt

var Array = {
  create: function(arr) {
    if (arr) {
      this.data = arr;
    } else {
      this.data = [];
    }
    return this;
  },
  each: function(func, reverse) {
  	if(typeof reverse !=="undefined" && reverse===true){
         for (var i=this.data.length-1; i>=0; i--) {
             if(func(i, this.data[i])===false)
                 break;
         }
    } else {
         for (var i=0; i<this.data.length; i++) {
            if(func(i, this.data[i])===false)
                break;
         }
    }
  }
};

var arr = Array.create([{
  val: 2
}, {
  val: 4
}, {
  val: 8
}]);

var val = 0;
console.time('custom each');
arr.each(function(e) {
  val = val + e.val;
});
console.timeEnd('custom each');

var _val = 0;
console.time('_each');
_.each(arr.data, function(e) {
  _val = _val + e.val;
});
console.timeEnd('_each');