# MostlyAdequate/mostly-adequate-guide

Mostly adequate guide to FP (in javascript)

Repository: https://github.com/MostlyAdequate/mostly-adequate-guide
Canonical: https://ross.abutalabs.com/products/mostly-adequate-guide
Language: JavaScript
License: NOASSERTION
License Family: other
Topics: javascript, functional-programming, tutorial, reactive-programming
Last push: 2024-09-17T06:18:40+00:00

## Health v2 (maintenance only)
Score: 23/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 4138, "days_push": 715, "days_rel": 715, "gap_med": null, "n_releases_24m": 1}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 23822, forks 1878 (observed 2026-08-28T04:11:35.396243+00:00)

## What it is
An open-source book teaching functional programming concepts using JavaScript, available online via GitBook with runnable exercises. It covers the functional paradigm including monads, pure functions, and algebraic data structures with an npm support module.

## Use cases
- learn functional programming in javascript
- understand monads and functors
- study pure functions and immutability
- practice fp concepts with exercises
- transition from oop to functional style
- find a free functional programming book

## When to choose
- you want to learn FP using a language you already use at work
- you prefer hands-on runnable exercises while reading
- you want a free, well-regarded introduction to functional concepts

## When to avoid
- you need a typed functional language like Haskell or Scala
- you want a reference manual rather than a tutorial
- you need production-ready FP libraries rather than learning material

## Facets
- artifact type: learning-resource
- maturity: stable
- function: documentation, developer-tools
- domain: tutorials, programming-languages
- platform: cross-platform
- tags: functional-programming, javascript, book, tutorial, monads, reactive-programming, gitbook, nodejs

## Member repositories
- MostlyAdequate/mostly-adequate-guide (main) score 23

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:11:35.396243+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 2026-08-29T16:56:20.008520+00:00, confidence not recorded.
  - readme: https://github.com/MostlyAdequate/mostly-adequate-guide (fetched 2026-08-28T04:11:35.396243+00:00, sha e1b0e30defe5)
  - registry_npm: https://registry.npmjs.org/mostly-adequate-guide (fetched 2026-08-29T07:54:13.429563+00:00, sha adef84b80499)
- Data as of 2026-08-30T08:39:29.467469+00:00.