# linq This is a JavaScript implementation of the .NET [LINQ](https://msdn.microsoft.com/en-us/library/bb308959.aspx) library. It contains all the original .NET methods plus a few additions. Written in pure JavaScript with no dependencies. ## Examples ```js // 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; }); ``` ```js // C# LINQ - lambda Enumerable.Range(1, 10).Where((i) => i % 3 == 0).Select((i) => i * 10); // linq.js - arrow function Enumerable.range(1, 10).where((i) => i % 3 == 0).select((i) => i * 10); ``` ```js // C# LINQ - anonymous type array.Select((val, i) => new { Value: val, Index: i }()); // linq.js - object literal Enumerable.from(array).select((val, i) => ({ value: val, index: i })); ``` See [sample/tutorial.js](https://github.com/mihaifm/linq/blob/master/sample/tutorial.js) and the [test](https://github.com/mihaifm/linq/tree/master/test) folder for more examples. # Usage ## Node.js (ES modules) Install the latest version of the library with npm: npm install linq Load it in your code with the `import` syntax: ```js import Enumerable from 'linq' let result = Enumerable.range(1, 10).where(i => i % 3 == 0).select(i => i * 10) console.log(result.toArray()) // [ 30, 60, 90 ] ``` Because the library is an ES module, this code will only work if your project is also configured as an ES module. Add the following line in your `package.json` to make it an ES module: ```json "type": "module" ``` If you're not planning to use ES modules, check the CommonJS section below. ## Node.js (CommonJS modules) Install version 3 of this library: npm install linq@3 Load it with the `require` syntax: ```js const Enumerable = require('linq') let count = Enumerable.range(1, 10).count(i => i < 5) console.log(count) // 4 ``` The [cjs](https://github.com/mihaifm/linq/tree/cjs) branch contains the source code for the CommonJS version of the library. ## TypeScript Install the latest version of the library with npm. Configure your compiler options in `tsconfig.json` ```json "compilerOptions": { "target": "ES2020", "moduleResolution": "node" } ``` The library comes with a `d.ts` file containing type definitions for all the objects and methods, feel free to use them in your code: ```ts import Enumerable from 'linq'; type tnum = Enumerable.IEnumerable; let x: tnum = Enumerable.from([1, 2, 3]); ``` ## Deno Import the library from deno.land. Use the `@deno-types` annotation to load type definitions: ```ts // @deno-types="https://deno.land/x/linq@4.0.0/linq.d.ts" import Enumerable from 'https://deno.land/x/linq@4.0.0/linq.js' let radius = Enumerable.toInfinity(1).where(r => r * r * Math.PI > 10000).first() ``` You can also install locally with npm. Use the full file path when importing the library: ```ts // @deno-types="./node_modules/linq/linq.d.ts" import Enumerable from './node_modules/linq/linq.js' ``` ## Browser The minified version of the library is available in the [release](https://github.com/mihaifm/linq/releases/latest) archive. Load it via ` ``` You can also load the library via a CDN: | CDN | URL | | ---------: | :----------------------------------------- | | unpkg | | | jsDelivr | | | packd | | # Credits [Yoshifumi Kawai](https://github.com/neuecc) developed the [original version](https://github.com/neuecc/linq.js/) of this library. # License [MIT License](https://github.com/mihaifm/linq/blob/master/LICENSE)

	Stars	Issues	Version	Updated	Created
dataframe			2.0.1	7 years ago	11 years ago
dataframe-js			1.4.4	4 years ago	8 years ago
linq			4.0.2	6 months ago	12 years ago
linq-es2015			2.5.1	4 years ago	8 years ago
linqjs	98	5	1.0.2	4 years ago	10 years ago

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