Interactive Extensions for JavaScript
JavaScript Other
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The Interactive Extensions for JavaScript... a set of libraries to compose pull-based collections and LINQ-style query operators in JavaScript

The Interactive Extensions for JavaScript (IxJS) is an implementation of Language Integrated Query (LINQ) to Objects in native JavaScript with a core set of operators on par with the .NET implementation. This implementation uses the same techniques for lazy evaluation of chained functions, for example map/select and filter/where. This allows you as the user to write rich expressive queries against a number of data sources without taking a performance hit.

We provide two files, a core implementation of LINQ to Objects in l2o.js and the Interactive Extensions in ix.js. The Interactive Extensions is a set of functions that were found to be useful for the Reactive Extensions (Rx) and were ported from the push model of Rx to a pull model.

Getting started is easy. Just reference the IxJS files:

<script src="l2o.js"></script>
<script src="ix.js"></script>

Next, we could generate data, filter it and then display the results

// Generate the data
var data = Ix.Enumerable.range(0, 10);

// Query the data
var query = data
	.map( function (x) {
		return x * x;
	.filter( function (x) {
		return x % 3 === 0;

// Now execute the query
query.forEach( function (x, idx) {
	console.log(x, idx);

Note the execution of the query doesn't take place until forEach is called.

This project is a mirror of the CodePlex repository.

About the Interactive Extensions Extensions

This set of libraries include:

  • l2o.js - Core LINQ to Objects library
  • ix.js - Interactive Extensions for JavaScript

API Documentation

You can find the documentation here as well as examples here.

Installation and Usage

There are multiple ways of getting started with the Interactive Extensions. The files are available on cdnjs and jsDelivr.

In a Browser:

<script src="l2o.js"></script>
<script src="ix.js"></script>

Installing with Bower

bower install Ix

Installing with Jam

jam install ix

Installing via NPM:

npm install ix
npm install -g ix

Using in Node.js:

var Ix = require('ix');

var source = Ix.Enumerable.fromArray([1,2,3]);

source.forEach(function (x) {
	console.log('Next: ' + x);	

// => Next 1 
// => Next 2 
// => Next 3

Installing all of IxJS via NuGet:

Install-Package IxJS-All

Or install via NuGet individual packages:

Install-Package IxJS-L2O
Install-Package IxJS-Main

Using IxJS with an AMD loader such as Require.js

    'paths': {
        'ix': 'path/to/ix.js'
['ix'], function(Ix) {
    var obs = Ix.Enumerable.returnValue(42);
    obs.forEach(function (x) { 
    	console.log('Next: ' + x); 

// => Next 42 


IxJS has been thoroughly tested against all major browsers and supports IE6+, Chrome 4+, FireFox 1+, and Node.js v0.4+.


Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. Microsoft Open Technologies would like to thank its contributors, a list of whom are at

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.