code: function (searchElement) {
                  var result = -1;
                  _gpfArrayEveryOwn(this, function (value, index) {
                      if (value === searchElement) {
                          result = index;
                          return false;
                      }
                      return true;
                  }, _gpfArrayGetFromIndex(arguments));
                  return result;
              }
docs: Introduced with JavaScript 1.5