Arrows to arrows, categories to queries (2025)
0 comments
- Points69
- Comments6
–Rank now
#22Peak rank
1Days on list
43Score · 7d
Nov 4, 2026First seen
Rank · 7 days
On Hacker News
- Points
- 69
- Comments
- 6
- Submitted by
- firstbase
- Posted
- Nov 4, 2026
- Site
- reasonablypolymorphic.com
Story details from Hacker News ↗ · linked article on reasonablypolymorphic.com.
Trending history
Arrows to arrows, categories to queries (2025) was first seen on Hacker News · Front page on Nov 4, 2026. Since then it has appeared in 50 checks on 1 different day. Its best position was #22 of 30, reached on Nov 4, 10:22 UTC. It dropped off the list after Nov 4, 15:37 UTC. The same link also trended on Lobsters, which raises its cross-platform score.
Rank history
Position on Hacker News · Front page at every check (lower is better).
Last 14 days
Best rank per day (UTC).
22
Oct 26today
Metric history
Platform metric as reported by Hacker News.
Where it trended
| List | Best | Days | Checks | Last seen |
|---|---|---|---|---|
| Hacker News · Front page | #22 | 1 | 50 | |
| LLobsters · Hottest Arrows to Arrows, Categories to Queries | same link | |||
From the discussion
A few top-level comments from Hacker News, shortened. Read the full thread on Hacker News.
Nice, I've also been playing around with creating a programming language based on some concepts in category theory, but I've been focusing more on the concept of polynomial functors. I know there is somewhat of a stigma against category theory on Hacker News for some reason, but it's cool to see people inspired to…
How does the use of arrows instead of functions actually help here? If you have a terminal object aka unit type `()`, then arrows `() ~> a` are equivalent to elements of `a`.
Featured in
Archived daily, weekly and monthly lists that include this entry.
Hacker News 1 day, best #22
Questions
Is Arrows to arrows, categories to queries (2025) trending on Hacker News right now?
Not at the moment. It was last on the list on Nov 4, 15:37 UTC, after 1 day of trending.
What is the highest rank Arrows to arrows, categories to queries (2025) reached?
#22 on Hacker News · Front page, on Nov 4, 10:22 UTC. Trendoday checks this list every 15 minutes.
How long has Arrows to arrows, categories to queries (2025) been trending?
It was first seen on Nov 4, 2026 and has been on the list on 1 day (50 checks) since.
How much discussion did it get on Hacker News?
69 points and 6 comments; submitted by firstbase on Nov 4, 2026.