Add some Contravariant exercises #347
Merged
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Partially satisfies #346 .
It would be neat to add some
Composeexercises, so I putCourse.Contravariantjust beforeCourse.Composein the README. I think traversable and contravariant might be more useful than comonad; maybe there's some scope to rearrange those?If I keep tinkering with this, I think the plan (of things to build, not necessarily order) will look something like:
We may want to take a detour through Semigroup and Monoid, as there's a common idiom there that people tend to use instead of
Divisible.