Iterators polyfill

This polyfill brings Iterators and Iterables to JavaScript for older browsers.

With ES2015, the Iterator Symbol is used to make an object Iterable. While there are many great things to say about Iterables, you probably already know and love them from for ... of expressions.

There is another polyfill out there, but it relies heavily on Object.defineProperty which doesn't work on non-DOM objects in IE8.

According to the EcmaScript 2015 standard specification, arguments are Iterable. That would make them usable in for ... of expressions. However, since there is no concept of an Argument interface in the specification yet, this would only be polyfillable by extending the prototype of Object. While that is a solution, it doesn't work in IE8. If you use rest parameters, please know that babel transpiles it into an array - so don't worry!

This polyfill adds Iterators for:

• Array
• String
• NodeList

The data types Map, Set and TypedArray all came with the EcmaScript 2015 standard. Great polyfills of those already implement iterables. Thus these are not included in this polyfill.

Dependencies

• It requires Symbol to be defined. Its easily polyfilled.

Install

Install with

npm install iterators-polyfill

Usage

Load it in your code with an import statement:

import "iterators-polyfill";

Or from a script tag:

<script src="../node_modules/iterators-polyfill/polyfill.min.js"></script>

The polyfill will be applied automatically if necessary. It works outside a global context too.