MostlyAdequate/mostly-adequate-guide resource

Health v2 · maintenance only

Flags: no_license

Adoption not part of the score

23822 stars · 1878 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

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

learning-resource · maturity stable

documentation developer-tools tutorials programming-languages cross-platform functional-programming javascript book tutorial monads reactive-programming gitbook nodejs

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