code: function (arr, callback, thisObj) {
    if (arr == null) {
      return;
    }
    var i = -1,
        len = arr.length;
    while (++i < len) {
      // we iterate over sparse items since there is no way to make it
      // work properly on IE 7-8. see #64
      if ( callback.call(thisObj, arr[i], i, arr) === false ) {
        break;
      }
    }
  }
docs: Copu from mout/array/forEach