is-implemented.js
469 Bytes
'use strict';
module.exports = function () {
var arr = [1, 'foo'], iterator, result;
if (typeof arr.entries !== 'function') return false;
iterator = arr.entries();
if (!iterator) return false;
if (typeof iterator.next !== 'function') return false;
result = iterator.next();
if (!result || !result.value) return false;
if (result.value[0] !== 0) return false;
if (result.value[1] !== 1) return false;
if (result.done !== false) return false;
return true;
};