JavaScript > Functional Programming
Contents
Libraries
A practical functional library for JavaScript that is designed specifically for a functional programming style. A style that makes it easy to create functional pipelines and never mutates user data. +TS.
is set of utility point-free functions composed only from Ramda functions.
An instance of Lodash with its methods wrapped to produce immutable, auto-curried, iteratee-first, data-last methods. +TS.
Powerful iterator utilities for TypeScript with statistical operations, windowing, and lazy evaluation. +TS
A lightweight functional JavaScript library that facilitates currying and point-free / tacit programming.
A modern and modular JavaScript utility library made to work well with vanilla JavaScript methods. -TS
A functional library for CoffeeScript (and JavaScript) to facilitate functional composition and higher order functions.
A tiny (2.7kb) functional programming library using native ES5/6 operations. -TS.
Functional tools that couldn’t be simpler. A dead simple functional utility belt, hand-crafted with love and attention. -TS.
A collection of functions which aid in making non-functional libraries functional.
Replace JSX in React with functions (currying, compositions and etc).
A functional user interface library with unidirectional dataflow and a virtual dom.
An experiment in adding functional pattern matching to JavaScript. Experimental
A functional utility library for working with JavaScript dates. All functions in date-fp are pure, autocurried and will not mutate the date objects they are applied to.
An immutable date and time library that provides a simple, domain-driven and clean API based on the ISO8601 calendar.
A micro library that encourages functional programming by making native methods available as partially applied functions.
FP library for JavaScript by Kyle Simpson (aka getify). Supports named-argument style methods.
Javascript parser combinator implementation inspired by the Haskell's Parsec
An abstraction for managing asynchronous code in JS. Tasks are similar to Promises with the key difference that Tasks can represent a computation while Promises can represent only the results of a computation. Ships with Flow type definitions.
Ultra-high performance reactive programming to help you compose asynchronous operations on streams of values and events without many of the hazards of side effects and mutable shared state.
Funfix is a library of type classes and data types for Functional Programming in JavaScript, TypeScript and Flow. +CT, +TS.
Arrays, Strings and things the functional way. A 640b functional library based on native methods. -TS.
An extremely small, intuitive and fast functional utility library for JavaScript -TS.
A small library provides simple usages of basic FP & pattern-matching/sumtype & MonadIO/Rx & Optional for Javascript. -TS.
Grid Computing Framework, Network & Thread extension of TSTL, supporting RFC (Remote Function Call). +TS.
Iterator library with support for objects as iterables, lazy evaulation andpipe(); implements Traits (from Rust)/Type Classes (from Haskell) in JS. -TS.
A collection of functional utilities that could conceivably be part of a library like lodash/fp, but for some reason or other are not.
Powerful pipes, that chain Promise and ADT like Maybe or Either from popular FP libraries. +TS
Comprehensive Curry Library with Operator Curry, Curry from functions, Decurry and Infifnite Curries.
Tiny TypeScript functional dependency injection, based on Node.js AsyncLocalStorage. +TS
A Fully-fledged functional effect system for typescript with a rich standard library. +TS
A type-safe, functional, performant, lawful, composable data structure that solves practical problems of effect-full code in node and browser. +TS
Fast, modern, and practical utility library for FP in TypeScript. (Uses a data-first approach like remeda, but is faster than remeda, ramda, rambda, and lodash/fp.)
A library for safe, idiomatic null and error handling in TypeScript, with Maybe and Result types, supporting both a functional style and a more traditional method-call style
The exhaustive Pattern Matching library for TypeScript, with smart type inference. Pattern Matching is a code-branching technique coming from FP languages.
Natural effect system that fits TypeScript; Write codes as you write plain typescript code.
Super lightweight function that looks and behaves like a pipe operator.
A powerful JavaScript functional programming toolset, including utility functions and abstract data structures.
A curated collection of 130+ common-use filter functions. Written in a functional programming style. Lightweight direct imports. Supports ES modules and CommonJS. 100% Unit tested. +TS
A tiny TypeScript library for handling side effects in a unified way using algebraic effects. +TS
Data Structures
Utilities for treating frozen JavaScript objects as persistent immutable collections
Immer is a tiny package for immutable state based on copy-on-write mechanism. +TS.
ClojureScript’s persistent data structures and supporting API from the comfort of vanilla JavaScript.
High performance implementation of Immutable Sequence in JavaScript, based on Finger Trees.
Functional Reactive State for JavaScript and TypeScript. DerivableJS enables you to make elegant declarative statements about how your bits of state are related. +TS.
Library for creating and manipulating lazy iterables using the ES2015 iteration protocols.
Super high-performance immutable data structures for modern JavaScript and TypeScript applications. +TS.
An extremely fast immutable list with a comprehensive functional API. Designed to seamlessly integrate with Ramda.
Immutable persistent collections, functional constructs such as Option and Either, and combinators. Implemented in Typescript but supports javascript too. +CT, +TS.
Algebraic Data Types
Not a library, but a specification of the Monad laws for libraries to follow.
Specification similar to Fantasy Land but based on static methods rather than instance methods.
Sanctuary makes it possible to write safe code without null checks. +CT, +TS.
A Future library with included control utilities, high performance and great error messages.
Port of the Haskell package Data.Aviary.Birds. Everything for your combinatory needs.
A collection of popular Algebraic Data Types with the main goal to curate and provide not only a common interface between each type, but also all of the helper functions needed to hit the ground running. -TS.
A small utility library with a set of Algebraic Data Types and Helper functions to help you write code in a functional programming style in Javascript
Functional programming library for TypeScript focusing on ADTs. +CT, +TS.
an async-first, opinionated, and functional language designed to have 100% compatibility with JavaScript engines
Small, simple, easy FP data types for pragmatic and productive developers who need to ship reliable code fast. +CT, +TS.
Tifi is a library for functional programming in TypeScript. It solves a problem of the existence of both undefined and null. Tifi is inspired by the OCaml/Reason utilities for the option data type. +CT, +TS.
A collection of popular monads (such as Either and Maybe) and the lazy iterator.
Functional Languages that Compile to JavaScript
Compiles Clojure, a hosted Lisp with immutable persistent data structures, to JavaScript.
Compiles a subset of Elixir, a dynamic, functional language designed for building scalable and maintainable applications, to JavaScript.
Programming Tools
Community
A curated list of awesome (functional) reactive programming stuff in JavaScript.
Awesome resources on functional programming theory and learning materials.