DayTwo refactor + CLI #1
Open
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Outdated suggestions cannot be applied.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.
DayTwoto use anEither Stringto handle parse errors instead of theN*constructors.firstfromBifunctorwas used to augment theStringerror message with context.traversewas used to process all thelinesand short-circuit on first error_ <$> _ <*> _) was used to process both sides of the round and pass them to theRoundVsconstructor. LYAH has a good section on applicative style[Round]is preferable toRounds)Rounda properdatatype + used an infixVsconstructor. This just looks nice :)LambdaCaseand used it quite a bit. It's a good syntax extension to learn!I also made
app/Main.hsan entrypoint for all the various days'mains. It parses the day number as the first argument, and then calls the correct daymainwith the rest of the args. Here's some example usage: