Add Choice Profunctor
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- Dominant language
- Scala
- Stars
- 5.5k
- Forks
- 1.2k
- Avg merge
- 2d 10h
- Merged PRs (30d)
- 5
Description
Useful for bootstrapping pure profunctor lenses
trait Choice[~>[_, _]] extends Profunctor[~>] {
def left[A, B, C](p: A ~> B): (C Xor A) ~> (C Xor B)
def right[A, B, C](p: A ~> B): (A Xor C) ~> (B Xor C)
}
object Choice {
def apply[F[_, _]](implicit ev: Choice[F]): Choice[F] = ev
}
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 locating the existing Profunctor definition and related typeclass patterns in the Cats source. Implement the Choice API shown in the issue, then identify the relevant tests or instance coverage and verify that the new typeclass integrates with the existing profunctor abstractions.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- scala
- Domain
- tooling
- Issue type
- Feature
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100