'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);
  };