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  • linqjs

    Project Description
    linq.js - LINQ for JavaScript

    Features

    • implement all .NET 4.0 methods and many extra methods (inspiration from RxAchiral, 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.jslinq.js-jQuerylinq.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

    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
    


    linq-jquery.jpg

    IntelliSense vsdoc

    linqjs_intellisense.jpg

    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();
    原文链接:https://archive.codeplex.com/?p=linqjs
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  • 原文地址:https://www.cnblogs.com/coce/p/8644123.html
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