linqjs

Project Description
linq.js - LINQ for JavaScript

Features

implement all .NET 4.0 methods and many extra methods (inspiration from Rx, Achiral, Haskell, Ruby, etc...)
complete lazy evaluation
full IntelliSense support for VisualStudio
two versions - linq.js and jquery.linq.js (jQuery plugin)
support Windows Script Host
binding for Reactive Extensions for JavaScript(RxJS) and IntelliSense Generator -> see documentation
NuGet install support(linq.js, linq.js-jQuery, linq.js-Bindings)

90 Methods

Aggregate, All, Alternate, Any, Average, BufferWithCount, CascadeBreadthFirst, CascadeDepthFirst, Catch, Choice, Concat,
Contains, Count, Cycle, DefaultIfEmpty, Distinct, Do, ElementAt, ElementAtOrDefault, Empty, Except, Finally, First, FirstOrDefault,
Flatten, ForEach, Force, From, Generate, GetEnumerator, GroupBy, GroupJoin, IndexOf, Insert, Intersect, Join, Last, LastIndexOf,
LastOrDefault, Let, Matches, Max, MaxBy, MemoizeAll, Min, MinBy, OfType, OrderBy, OrderByDescending, Pairwise, PartitionBy,
Range, RangeDown, RangeTo, Repeat, RepeatWithFinalize, Return, Reverse, Scan, Select, SelectMany, SequenceEqual, Share, Shuffle,
Single, SingleOrDefault, Skip, SkipWhile, Sum, Take, TakeExceptLast, TakeFromLast, TakeWhile, ThenBy, ThenByDescending, ToArray,
ToDictionary, ToInfinity,ToJSON, ToLookup, ToNegativeInfinity, ToObject, ToString, Trace, Unfold, Union, Where, Write, WriteLine, Zip

see details - linq.js Reference & LINQPad

Starting linq.js ver.3.0.0-beta!(2012/07/19)

Get the ver.3.0.4-Beta5 @2013/06/20
or NuGet Install-Package linq.js -Pre, linq.js-jQuery -Pre, linq.js-RxJS -Pre, linq.js-QUnit -Pre
Now TypeScript Generics(0.9) support!

Please try it! and give me a feedback!
http://linqjs.codeplex.com/discussions/376207

Query objects or json

sample from http://twitter.com/statuses/public_timeline.json

var jsonArray = [

    { "user": { "id": 100, "screen_name": "d_linq" }, "text": "to objects" },

    { "user": { "id": 130, "screen_name": "c_bill" }, "text": "g" },

    { "user": { "id": 155, "screen_name": "b_mskk" }, "text": "kabushiki kaisha" },

    { "user": { "id": 301, "screen_name": "a_xbox" }, "text": "halo reach" }

]

// ["b_mskk:kabushiki kaisha", "c_bill:g", "d_linq:to objects"]

var queryResult = Enumerable.From(jsonArray)

    .Where(function (x) { return x.user.id < 200 })

    .OrderBy(function (x) { return x.user.screen_name })

    .Select(function (x) { return x.user.screen_name + ':' + x.text })

    .ToArray();

// shortcut! string lambda selector

var queryResult2 = Enumerable.From(jsonArray)

    .Where("$.user.id < 200")

    .OrderBy("$.user.screen_name")

    .Select("$.user.screen_name + ':' + $.text")

    .ToArray();

High compatibility with C# Linq

// C# LINQ (delegate)

Enumerable.Range(1, 10)

    .Where(delegate(int i) { return i % 3 == 0; })

    .Select(delegate(int i) { return i * 10; });

// linq.js - anonymous function

Enumerable.Range(1, 10)

    .Where(function(i) { return i % 3 == 0; })

    .Select(function(i) { return i * 10; });

// C# LINQ (lambda)

Enumerable.Range(1, 10).Where(i => i % 3 == 0).Select(i => i * 10);

// linq.js - lambda expression

Enumerable.Range(1, 10).Where("i => i % 3 == 0").Select("i => i * 10");

// $ is default iterator variable like Scala's "_" or Groovy's "it"

Enumerable.Range(1, 10).Where("$ % 3 == 0").Select("$ * 10");

 // "" is shorthand of "x => x" (identity function)

Enumerable.Range(4, 7).Join(Enumerable.Range(8, 5), "", "", "outer,inner=>outer*inner");

// Enumerable.From is wrap from primitive array, string(to charArray), object(to KeyValuePair[]) etc..

var array = [100, 200, 30, 40, 500, 40, 200];

var ex1 = Enumerable.From(array).Distinct().ToArray(); // [100, 200, 30, 40, 500]

var ex2 = Enumerable.From("foobar").ToArray(); // ["f", "o", "o", "b", "a", "r"];

var ex3 = Enumerable.From({foo:10, bar:20}).ToArray(); // [{Key:"foo",Value:10}, {Key:"bar",Value:20}]

// C# - AnonymousType

array.Select((val, i) => new { Value = val, Index = i });

// linq.js - object literal

Enumerable.From(array).Select("val,i=>{Value:val, Index:i}")

jQuery plugin version

// $.Enumerable

$.Enumerable.Range(1, 10).Where("$%2==0").ForEach("alert($)");

// TojQuery - Enumerable to jQuery

$.Enumerable.Range(1, 10)

    .Select(function (i) { return $("<option>").text(i)[0] })

    .TojQuery()

    .appendTo("#select1");

// toEnumerable - jQuery to Enumerable

var sum = $("#select1").children()

    .toEnumerable()

    .Select("parseInt($.text())")

    .Sum(); // 55

IntelliSense vsdoc

video - using with Visual Studio 2010

Launch in another window

video - how to debug linq.js