is-implemented.js
481 Bytes
'use strict';
var iteratorSymbol = require('es6-symbol').iterator;
module.exports = function () {
var arr = ['foo', 1], iterator, result;
if (typeof arr[iteratorSymbol] !== 'function') return false;
iterator = arr[iteratorSymbol]();
if (!iterator) return false;
if (typeof iterator.next !== 'function') return false;
result = iterator.next();
if (!result) return false;
if (result.value !== 'foo') return false;
if (result.done !== false) return false;
return true;
};