Missing instances for Cofree
Nobody has claimed this yet.
- Dominant language
- Scala
- Stars
- 5.5k
- Forks
- 1.2k
- Avg merge
- 2d 10h
- Merged PRs (30d)
- 5
Description
https://hackage.haskell.org/package/free-4.1/docs/Control-Comonad-Cofree.html
There are some instances/derivations in the Haskell version of Cofree that might be useful for some people (I for one would welcome Eq):
- Eq
- Ord
- Show
Alternative f => Monad (Cofree f)- Distributive
Possibly more, but these are the ones I noticed missing now.
I'd love to take a shot at implementing them, if it sounds like a good idea :)
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by comparing the requested Cofree instances with the Haskell documentation linked in the issue, paying attention to the Alternative instance's tailRecM requirement. Confirm which of Eq, Ord, Show, Alternative, and Distributive are still appropriate for Cats, then verify the selected instances and their behavior with the project's existing checks.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- scala
- Domain
- data
- Issue type
- Feature
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100