linq-fns

.NET LINQ functions for JavaScript written in TypeScript.

• ⚡ Provides Queryable<T>,which is reusable, variable and uses a predicate collection for deferred execution.
• 🔨 Contains most of the original .NET methods and some additional methods.
• 🔨 Supports Promise as an input source.
• 🙅 All APIs are JavaScript native methods so can be easily incorporated into existing JavaScript projects.
• 📊 Includes some simple drivers (such as Firebase Realtime database).

npm install linq-fns --save

Browser client files can be found in the release folder.

Basic example

Node or browser

// ES6
import { Queryable } from 'linq-fns';
// ES5
const Queryable = require('linq-fns').Queryable;

let query = Queryable
            .from(nations)
            .join(continents, (x, y) => x.areaId === y.id)
            .groupBy(o => o.y.areaName)
            .select(x => {
                return {
                    area: x.key,
                    total: Queryable.fromSync(x.items).count() 
                    // This will return a number, not Promise<number>
                }
            })

// Async/ await
const data = await query.toList();

// Promise
// Will return Promise<{area:string, total:number}>
const asyncData = query.toList(); 
asyncData.then(data => {
    console.log(data);
    // [
    //     {area: 'Euro': total: 2},
    //     {area:'South America', total: 1}
    // ]
});

Firebase

const FireBaseQueryable = require('linq-fns').FireBaseQueryable;
const admin = require('firebase-admin');
const serviceAccount = require('./serviceAccountKey');

admin.initializeApp({
    credential: admin.credential.cert(serviceAccount),
    databaseURL: 'https://xxx.firebaseio.com'
});

const db = admin.database();
const postsRepo = new FireBaseQueryable(db,'<yourdb>.posts');

// READ AND QUERY DATA
// ES5 Promise
postsRepo.getQuery()
    .where('...')
    .select('...')
    .toList().then(x=>'...');

// Async/await
const data = await postsRepo.getQuery()
                            .where('...')
                            .select('...')
                            .toList();

// WRITE DATA
// Prepare calls, but do not send requests to server
postsRepo.add(item);
postsRepo.remove(item);
postsRepo.update(item);

// Call this to execute 3 above methods
postsRepo.commitChanges();

localStorage

// Node
const LocalStorageQueryable = require('linq-fns').LocalStorageQueryable;
const postsRepo = new LocalStorageQueryable("posts");

postsRepo.add(item);
postsRepo.remove(item);
postsRepo.update(item);

// Call this to execute 3 above methods
postsRepo.commitChanges();

gist file

//Node
const GistQueryable = require('linq-fns').GistQueryable;
const postsRepo = new GistQueryable(
    "6d183b7f997819cd5a8354f35c1e471f123", // gist file
    "259f97b96762c9d3a155630d12321fd1cfaf253ff", // access token
    "posts") // table name

postsRepo.add(item);
postsRepo.remove(item);
postsRepo.update(item);
postsRepo.commitChanges();

Process

1.Methods

• from
• where
• select
• selectMany
• join
• leftJoin
• groupJoin
• orderBy
• orderByDescending
• take
• takeWhile
• skip
• skipWhile
• groupBy
• distinct
• concat
• zip
• union
• intersect
• except
• first : Promise<T>
• firstOrDefault : Promise<T | null>
• last : Promise<T>
• lastOrDefault : Promise<T | null>
• single
• singleOrDefault
• contains
• sequenceEqual
• any : Promise<boolean>
• all : Promise<boolean>
• count : Promise<number>
• min : Promise<number>
• max : Promise<number>
• sum : Promise<number>
• average
• aggregate
• toList : Promise<T[]>

2. Drivers

• Firebase : Node
• Localstorage : Node & Browser
• Gists Github : Node & Browser
• ...

Documents

https://github.com/jinhduong/linq-fns/tree/docs

License

MIT License