Haskell Planetarium

Link aggregator of discussions about the Haskell programming language

Discourse

Rust-style Attribute Macro in Haskell, using GHC 10 Modifiers Extension
9 answers
Thu 2026/09/24
Issue 543 :: Haskell Weekly newsletter
Thu 2026/09/24
Https://github.com/haskell-actions/run-ormolu archived?
5 answers
Thu 2026/09/24
Moggi - a kind of strict version of Haskell running on JVM, .NET & PHP
1 answer
Thu 2026/09/24
Writing Parquet Files Using Haskell
5 answers
Wed 2026/09/23
[Well-Typed Blog] Haskell ecosystem activities report: June–August 2026
10 answers
Wed 2026/09/23
Why can (Cons i (q i)) -> (Cons o (q o)) have an arrow instance, but not [i] -> [o]
1 answer
Tue 2026/09/22
Helsinki Haskell Meetup, October 22
Mon 2026/09/21
Lask — a task runner with its own typed language, written in Haskell
Sun 2026/09/20
[ANN] pure-borrow-0.1.0.0
Sun 2026/09/20

Reddit

FUN: First-Class Functions, Currying, and a Surprise
Thu 2026/09/24
Moggi - a kind of version of Haskell, that is strict and runs on JVM, .NET & PHP
17 comments
Thu 2026/09/24
Some of my thoughts/experience on learning Haskell and a specific problem
5 comments
Tue 2026/09/22
Useful code with some fancy category theory / type theory ?
14 comments
Tue 2026/09/22
LYAHFGG: Chapter 6
6 comments
Tue 2026/09/22
Category Theory Explained for Haskell Programmers – Part 1 ZuriHac 2026
1 comment
Tue 2026/09/22
Writing Parquet Files Using Haskell
1 comment
Tue 2026/09/22
The Comonad.Reader returns
10 comments
Tue 2026/09/22
Upcoming Helsinki Haskell Meetup, October 22
Mon 2026/09/21
Can't add Complex Int types
14 comments
Sun 2026/09/20

Planet Haskell

Tweag I/O: Tricorder MCP server: feedback your agent won't forget
Thu 2026/09/24
Mark Jason Dominus: Noting another house repair chore victory
Wed 2026/09/23
Mark Jason Dominus: Work diary victory
Tue 2026/09/22
Well-Typed.Com: Haskell ecosystem activities report: June–August 2026
Fri 2026/09/18
GHC Developer Blog: GHC 10.0.1-alpha1 is now available
Fri 2026/09/18
Tweag I/O: Restoring type class support in Liquid Haskell
Thu 2026/09/17
GHC Developer Blog: GHC 9.14.2-rc2 is now available
Thu 2026/09/17
Bryan O'Sullivan: Announcing jj-stack: stacked GitHub pull requests for Jujutsu
Mon 2026/09/14
Mark Jason Dominus: George Orwell's essay on the atomic bomb anticipates Nineteen Eighty-Four
Sat 2026/09/12
Haskell Interlude: 86: Michael Hanus
Fri 2026/09/11

Stack Overflow

How do I run Haskell with ghcid in Vim terminal (i.e. not Neovim, GVim, ...)?
1 answer
Sat 2026/08/29
Why do I have to hit enter twice to evaluate a list comprehension with a local let in GHCi?
1 answer
Sat 2026/08/22
Lazy IO and concurrency in Haskell
2 answers
Wed 2026/08/19
Is it possible to generate a reversed list of reversed permutations of a list?
1 answer
Sun 2026/08/16
How do I turn an algorithm accepting a total function into an algorithm that accepts a function returning Maybe and that returns itself Maybe?
1 answer
Wed 2026/08/12
co-log: ambiguous type variable from a use of `withLog`
Thu 2026/07/30
OpenGL with GLFW code (with haskell bindings) inside WSL2 with NIXOS results in a segfault if taking input form terminal
Thu 2026/07/30
When is a 'rigid type variable' not rigid?
1 answer
Wed 2026/07/08
couldn't use haskell-language-server-9.14.1 with nix
1 answer
Fri 2026/06/12
Methods as higher ordered functions
1 answer
Thu 2026/06/11

Code Review Stack Exchange

How to implement an AVL tree efficient enough in Haskell?
1 answer
Tue 2025/04/01
Pattern Finding In Lists of Strings (2d Char Array), Advent of Code Day 04 Solution
2 answers
Fri 2024/12/20
Value-level proofs of type-level membership and subset relations in Haskell
Fri 2024/12/06
HackerRank, Haskell simple "compression" algorithm
3 answers
Sun 2024/08/18
Scraping the calendar of some public libraries from their websites
1 answer
Sat 2024/08/03
Haskell 2-player TicTacToe terminal game
1 answer
Fri 2024/06/07
Parse 2D Cartesian coordinates and output their Polar form
1 answer
Mon 2024/05/13
Last Stone Weight Problem in Haskell Using `fold`
Fri 2024/03/29
Last Stone Weight Problem in Haskell using list `insert`
1 answer
Tue 2024/03/19
Haskell code optimization for short Pi approximator
1 answer
Sun 2023/10/29

Haskell Weekly

Issue 543 - 2026-09-24
Thu 2026/09/24
Issue 542 - 2026-09-17
Thu 2026/09/17
Issue 541 - 2026-09-10
Thu 2026/09/10
Issue 540 - 2026-09-03
Thu 2026/09/03
Issue 539 - 2026-08-27
Thu 2026/08/27
Issue 538 - 2026-08-20
Thu 2026/08/20
Issue 537 - 2026-08-13
Thu 2026/08/13
Issue 536 - 2026-08-06
Thu 2026/08/06
Issue 535 - 2026-07-30
Thu 2026/07/30
Issue 534 - 2026-07-23
Thu 2026/07/23