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Fast, modern, and practical utility library for FP in TypeScript.

Documentation

Full documentation can be found here.

Features

  • πŸš€ built in ReScript, which generates highly performant JavaScript code (see the benchmark results here)
  • πŸ‘€ provides more readable code, due to the data-first approach
  • ✨ supports TypeScript and Flow
  • πŸ›‘ helps you write safer code with Option and Result types
  • 🎯 all functions return immutable data (no side-effects)
  • 🌲 tree-shakeable
  • πŸ“ fully documented

Getting started

Installation

yarn add @mobily/ts-belt

or with npm

npm install @mobily/ts-belt --save

Usage

Module Namespace Description
Array A Utility functions for Array.
Boolean B Utility functions for Boolean.
Number N Utility functions for Number.
Object (Dict) D Utility functions for Object.
String S Utility functions for String.
Guards G Various TypeScript guards.
Option O Functions for handling the Option type that represents the existence and nonexistence of a value.
Result R Functions for describing the result of a certain operation without relying on exceptions.
Function F Other useful functions.
import { A, O, N, pipe } from '@mobily/ts-belt'

pipe(
  [1, 2, 3, 4, 5], // β†’ [1, 2, 3, 4, 5]
  A.dropExactly(2), // β†’ Some([3, 4, 5])
  O.flatMap(A.head), // β†’ Some(3)
  O.map(N.multiply(10)), // β†’ Some(30)
  O.getWithDefault(0), // β†’ 30
) // β†’ 30

Contributors


Marcin Dziewulski

πŸ’» πŸ“– ⚠️ 🎨

Krzysztof Lenda

πŸ“–

Radek KozieΕ‚

πŸ“–

Artur

πŸ“–

Dominik ŁopaciΕ„ski

πŸ“–

Jakub WΔ…sik

πŸ“–

Krystian Mateusiak

πŸ’» πŸ“– ⚠️

MichaΕ‚ Miszczyszyn

πŸ€”

Kevin

πŸ“–

Anthony Khong

πŸ’» πŸ“– ⚠️

License

The MIT License.

See LICENSE