Haskell Planetarium

Link aggregator of discussions about the Haskell programming language

Discourse

Which extensions should be part of the next GHC20xx?
5 answers
Tue 2026/08/18
Kind evaluation in HLS
3 answers
Tue 2026/08/18
(Yet another) category suggestion: LLMs
5 answers
Tue 2026/08/18
2026-08-18 Infrastructure Update
Tue 2026/08/18
Downloads.haskell.org is down
2 answers
Tue 2026/08/18
`Arbitrary` instances for GADTs
Tue 2026/08/18
Upcoming maintenance on Stackage services, 20 August 2026
Tue 2026/08/18
The Haskell Foundation seeks a Head of Development
Mon 2026/08/17
London Haskell Meetup - September
Mon 2026/08/17
Haskell on your iPhone: a GHC 9.8 iOS cross-compiler from scratch
Sun 2026/08/16

Reddit

Happy parser giving and error
Tue 2026/08/18
Rethinking Database Programming by Evan Czaplicki
2 comments
Tue 2026/08/18
Experienced Dev in Java, Kotlin, TS. What should my Haskell journey be to proficiency?
6 comments
Tue 2026/08/18
Some questions about lib development
4 comments
Tue 2026/08/18
Can Haskell Become a Great Language for Data Science?
1 comment
Tue 2026/08/18
Does Zed Extension support all things the VScode Extension does?
2 comments
Mon 2026/08/17
London Haskell Meetup - September
1 comment
Mon 2026/08/17
Why GHC CallStack mechanism doesn't have an (optional?) way to dedup the callstack?
7 comments
Mon 2026/08/17
Is a "one command zero config vim like editor specifically for haskell useful?
4 comments
Mon 2026/08/17
fuyu-gpio: High-level, type-safe interface for Linux GPIO (libgpiod v2).
1 comment
Mon 2026/08/17

Planet Haskell

Mark Jason Dominus: The road to epsilon-zero: Productive programs and well-founded orders
Thu 2026/08/13
Magnus Therning: Emacs salmagundi, 2026-08-13
Thu 2026/08/13
Mark Jason Dominus: There are two kinds of theorems
Tue 2026/08/11
Abhinav Sarkar: Fast Haskell Scripts on GitHub Actions
Mon 2026/08/10
Oskar Wickström: How Antithesis Found and Explained a Bombadil Race Condition
Thu 2026/08/06
Mark Jason Dominus: The road to epsilon-zero: Coin-moving games with no coins
Wed 2026/08/05
Philip Wadler: Just Work: The Gig Economy, Platform Capitalism and the Battle for Worker Rights
Wed 2026/08/05
in Code: "Five-Point Haskell": Unconditional Election (via Parametricity)
Tue 2026/08/04
Mark Jason Dominus: Seven books I keep close because I love them
Mon 2026/08/03
GHC Developer Blog: GHC 9.12.5-rc3 is now available
Fri 2026/07/31

Stack Overflow

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?
3 answers
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
Use stack to build executable of a package dependency
2 answers
Thu 2026/06/04
I cannot install cuda haskell package on WSL2
4 answers
Sun 2026/05/31
Optional logging with a writer monad in haskell
5 answers
Fri 2026/05/22

Code Review Stack Exchange

Augment vi editing mode in haskeline by implementing the ; and , commands
Wed 2025/09/03
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 Weekly

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
Issue 533 - 2026-07-16
Thu 2026/07/16
Issue 532 - 2026-07-09
Thu 2026/07/09
Issue 531 - 2026-07-02
Thu 2026/07/02
Issue 530 - 2026-06-25
Thu 2026/06/25
Issue 529 - 2026-06-18
Thu 2026/06/18
Issue 528 - 2026-06-11
Thu 2026/06/11