541.js

gistfile1.js

MYAPP.utilities.array = (function () {
  var array_string = "[object Array]",
      ops = Object.prototype.toString,

      inArray = function (haystack, needle) {
        for (var i = 0, max = haystack.length; i < max; i += 1) {
          if (haystack[i] === needle) {
            return i;
          }
        }
        return -1;
      },
      isArray = function (a) {
        return ops.call(a) === array_string;
      };

  return {
    isArray: isArray,
    indexOf: inArray
  };
}());