r/functionalprogramming is a subreddit with 34k members. The most common kinds of discussions are solution requests and advice requests, and the community frequently discusses functional programming, languages, haskell, language, and lambda calculus.
A subreddit for functional programming related material.
Popular Themes in r/functionalprogramming
#1
Solution Requests
: "Books on Category Theory for Computer Science"
11 posts
#2
Advice Requests
: "What's the benefit of learning Elixir?"
6 posts
#3
Pain & Anger
: "FP is easy to understand than oop for me"
3 posts
#4
Self-Promotion
: "I created an open-source functional visual programming language"
1 post
#5
News
: "Gleam v1.2 released with LSP improvements"
1 post
Popular Topics in r/functionalprogramming
#1
Functional Programming
: "Slides of my talk "Functional Programming: Failed Successfully:"
88 posts
#2
Languages
: "What Languages to start learning FP?"
14 posts
#3
Haskell
: "2nd language after Haskell "
12 posts
#4
Language
: "What Language is my best shot to actually get a job doing FP in 2024?"
12 posts
#5
Lambda Calculus
: "Programming with Math | The Lambda Calculus"
10 posts
#6
Functional
: "My book Functional Design and Architecture is finally published!"
10 posts
#7
Elixir
: "What's the benefit of learning Elixir?"
8 posts
#8
Fp
8 posts
#9
Types
: "I made practical session Types based on linear logic in Rust — 'par'"
7 posts
#10
Ocaml
: "What about Ocaml"
6 posts
Flair Used in r/functionalprogramming
#1
Question
: "Why do people react consistently negatively to functional programming?"
72 posts
#2
FP
: "My book Functional Design and Architecture is finally published!"
46 posts
#3
Intro to FP
: "How the functional programming in Scala book simplified my view on side effects"
19 posts
#4
Gleam
: "Gleam v1.0.0 released!"
10 posts
#5
λ Calculus
: "Lambda Calculus basics in every language"
5 posts
#6
JavaScript
: "L0's $3100 Airdrop: Limited Time"
4 posts
#7
Elm
: "I made a surf forecast website entirely with Elm and elm-pages"
4 posts
#8
News
: "Nevalang: A Flow-Based Programming Language"
4 posts
#9
OO and FP
: "Why You Should Care About Functional Programming (Even in 2025)"
4 posts
#10
Category Theory
: "Books on Category Theory for Computer Science"
3 posts
Member Growth in r/functionalprogramming
Yearly
+3k members(10.6%)
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Last updated: June 22, 2026