Project Descriptionlinq.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 MethodsAggregate, 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
Starting linq.js ver.3.0.0-beta!(2012/07/19)
Get the ver.3.0.3-Beta4 @2012/10/09
or NuGet Install-Package linq.js -Pre, linq.js-jQuery -Pre, linq.js-RxJS -Pre, linq.js-QUnit -Pre
Now TypeScript 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
video - how to debug linq.js
with Windows Script Host
// 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();