'use strict';

var isArguments    = require('es5-ext/function/is-arguments')
  , isString       = require('es5-ext/string/is-string')
  , ArrayIterator  = require('./array')
  , StringIterator = require('./string')
  , iterable       = require('./valid-iterable')
  , iteratorSymbol = require('es6-symbol').iterator;

module.exports = function (obj) {
	if (typeof iterable(obj)[iteratorSymbol] === 'function') return obj[iteratorSymbol]();
	if (isArguments(obj)) return new ArrayIterator(obj);
	if (isString(obj)) return new StringIterator(obj);
	return new ArrayIterator(obj);
};