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Showing content from https://github.com/neuecc/linq.js/ below:

GitHub - neuecc/linq.js: LINQ for JavaScript.

LINQ for JavaScript.

Archive, import from Codeplex.

I recommend use fork version - mihaifm/linq

• implement all .NET 4.0 methods and many extra methods (inspired from Rx, 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

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

Get v3 branch or NuGet Install-Package linq.js -Pre, linq.js-jQuery -Pre, linq.js-RxJS -Pre, linq.js-QUnit -Pre

All methods becomes lower-camel-case.

• 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();

// 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}")

// $.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

// get folder name and file name...

var dir = WScript.CreateObject("Scripting.FileSystemObject").GetFolder("C:\\");
 
// normally
var itemNames = [];
for (var e = new Enumerator(dir.SubFolders); !e.atEnd(); e.moveNext())
{
    itemNames.push(e.item().Name);
}
for (var e = new Enumerator(dir.Files); !e.atEnd(); e.moveNext())
{
    itemNames.push(e.item().Name);
}

// linq.js
var itemNames2 = Enumerable.From(dir.SubFolders).Concat(dir.Files).Select("$.Name").ToArray();

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