1 var global = require('../internals/global');
2 var call = require('../internals/function-call');
3 var aCallable = require('../internals/a-callable');
4 var anObject = require('../internals/an-object');
5 var tryToString = require('../internals/try-to-string');
6 var getIteratorMethod = require('../internals/get-iterator-method');
8 var TypeError = global.TypeError;
10 module.exports = function (argument, usingIterator) {
11 var iteratorMethod = arguments.length < 2 ? getIteratorMethod(argument) : usingIterator;
12 if (aCallable(iteratorMethod)) return anObject(call(iteratorMethod, argument));
13 throw TypeError(tryToString(argument) + ' is not iterable');