# JasonShin/fp-core.rs

A library for functional programming in Rust

Repository: https://github.com/JasonShin/fp-core.rs
Canonical: https://ross.abutalabs.com/products/fp-corers
Language: Rust
License: MIT
License Family: permissive
Topics: functional-programming, rust, monad, functor, applicative, category-theory, lambda-calculus, monoid, hkt, homomorphism, morphism, comonad
Last push: 2026-03-12T13:11:13+00:00

## Health v2 (maintenance only)
Score: 64/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 71, release rhythm 35, longevity 100
- inputs: {"age_days": 2653, "days_push": 174, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1428, forks 69 (observed 2026-08-28T04:04:42.016504+00:00)

## What it is
fp-core.rs is a Rust library providing purely functional data structures and abstractions such as functors, monads, applicatives, and monoids. It also serves as a glossary of functional programming jargon illustrated with Rust examples.

## Use cases
- write functional-style Rust code with monads and functors
- learn functional programming concepts like monoids and category theory in Rust
- simulate higher-kinded types in Rust
- use purely functional data structures alongside the Rust standard library
- understand FP jargon like morphisms and applicatives with code examples

## When to choose
- you want FP abstractions (monad, functor, applicative) in Rust
- you are learning functional programming theory with Rust examples
- you need purely functional data structures in a Rust project

## When to avoid
- you prefer idiomatic Rust without FP abstractions
- you need a production-hardened, actively developed FP library
- your project avoids extra abstraction overhead

## Facets
- artifact type: library
- maturity: maintenance
- function: programming-language, developer-tools
- domain: programming-languages, developer-tools
- platform: rust
- tags: functional-programming, monads, functors, category-theory, higher-kinded-types, lambda-calculus, monoid, comonad, applicative, algorithms

## Member repositories
- JasonShin/fp-core.rs (main) score 64

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:42.016504+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T04:37:17.730547+00:00, confidence not recorded.
  - readme: https://github.com/JasonShin/fp-core.rs (fetched 2026-08-28T04:04:42.016504+00:00, sha 10f79d76b4bb)
- Data as of 2026-08-30T08:39:29.467469+00:00.