A lightweight, TypeScript-first functional programming library for JavaScript with auto-currying and point-free style.
functional.js is a lightweight functional programming library for JavaScript and TypeScript that facilitates currying and point-free programming. It provides a set of utilities for composing functions, transforming data, and working with arrays and objects in a functional style. The library solves the need for a type-safe, performant, and dependency-free alternative to larger functional libraries.
JavaScript and TypeScript developers who want to adopt functional programming patterns, especially those working on projects where bundle size and type safety are critical.
Developers choose functional.js for its strong TypeScript support, minimal footprint, and competitive performance compared to alternatives like Ramda or lodash/fp. Its zero-dependency design and modern module support make it easy to integrate into any project.
A functional JavaScript library that facilitates currying and point-free programming
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Full TypeScript support with excellent inference, as demonstrated in the 'TypeScript Support' section with examples of pipe and map that maintain type safety.
Only ~3KB gzipped with zero dependencies, making it ideal for bundle-sensitive projects, explicitly stated in the 'Features' section.
Enables easy partial application and point-free style, shown in the 'Using Curry' and 'Point-Free Style' examples with clear code snippets.
Competitive speed and memory usage, with benchmarks in the README showing wins in 31 of 45 ops/sec metrics and leading cold start times.
Dual ESM and CJS package for compatibility, mentioned in the 'Features' as supporting both modern and legacy JavaScript environments.
No mention of async function support or promise handling in the README, which is a gap for modern web applications relying on asynchronous data flows.
Compared to established libraries like Ramda or lodash, functional.js has a smaller community and fewer third-party resources, as implied by its newer status and focused API.
Functions are data-last by default, which can be counterintuitive for developers accustomed to data-first APIs or native JavaScript methods, potentially increasing initial learning friction.
functional.js is an open-source alternative to the following products:
lodash/fp is the functional programming variant of Lodash that provides auto-curried, iteratee-first, data-last methods for functional programming patterns in JavaScript.
Ramda is a practical functional programming library for JavaScript that emphasizes immutability and side-effect free functions with a data-last API design.
fp-ts is a TypeScript library for functional programming, providing typed functional programming abstractions like Option, Either, and Task.