tomi / fromfrom

fromfrom

fromfrom is a LINQ inspired library to transform sequences of data.

Installation

npm install --save fromfrom

Documentation

Find it here.

Usage

The library exports only a single function, from. from wraps the given source data into a Sequence. Sequence has a wide range of chainable methods to operate and transform the sequence. The sequence can then be converted into a JS type.

For example

import { from } from "fromfrom";

// Transform an array of users
const users = [
  { id: 1, name: "John", age: 31, active: true },
  { id: 2, name: "Jane", age: 32, active: false },
  { id: 3, name: "Luke", age: 33, active: false },
  { id: 4, name: "Mary", age: 34, active: true },
];

from(users)
  .filter(user => user.active)
  .sortByDescending(user => user.age)
  .toArray();
// Returns
// [
//   { id: 4, name: "Mary", age: 34, active: true },
//   { id: 1, name: "John", age: 31, active: true }
// ]

Features

Familiar method names - Even though it's LINQ inspired, uses familiar method names from JS.
Supports all main JS types - Works with arrays, objects, maps, sets, and objects that implement the iterable protocol.
No dependencies - Guarantees small size.
Type safe - Written in TypeScript. Type definitions included.
Deferred execution - The execution of the sequence is deferred until you begin consuming the sequence.
Fully tested - 100% test coverage.

How does it work

See "how does it work" section from the initial release blog post.

Development

NPM scripts

npm t: Run test suite
npm start: Run npm run build in watch mode
npm run test:watch: Run test suite in interactive watch mode
npm run test:prod: Run linting and generate coverage
npm run build: Generate bundles and typings, create docs
npm run lint: Lints code
npm run commit: Commit using conventional commit style (husky will tell you to use it if you haven't 😉)