'use strict';
  
  module.exports = function () {
  	var arr = [1, 'foo'], iterator, result;
  	if (typeof arr.keys !== 'function') return false;
  	iterator = arr.keys();
  	if (!iterator) return false;
  	if (typeof iterator.next !== 'function') return false;
  	result = iterator.next();
  	if (!result) return false;
  	if (result.value !== 0) return false;
  	if (result.done !== false) return false;
  	return true;
  };