I can think of two ways to do checks.
The more general way: make sure that applyRules calls Result.map and Result.andThen
The more specific way: make sure that all of oneStonePerPointRule captureRule libertyRule koRule and changePlayer are called with Result.* instead of in the pattern matching.
The second way is motivated by my own experience of using changePlayer in the pattern matching at the end in my first draft. Since the instructions say it should only be done if all passes, it made sense. Of course, using in with Result.map is a lot more clever, so maybe other students could be lead to this solution.
Or maybe a mix of both? Check in general and only a special one for changePlayer.
Source.
I can think of two ways to do checks. The more general way: make sure that
applyRulescallsResult.mapandResult.andThenThe more specific way: make sure that all of
oneStonePerPointRule captureRule libertyRule koRuleandchangePlayerare called withResult.*instead of in the pattern matching.The second way is motivated by my own experience of using
changePlayerin the pattern matching at the end in my first draft. Since the instructions say it should only be done if all passes, it made sense. Of course, using in withResult.mapis a lot more clever, so maybe other students could be lead to this solution.Or maybe a mix of both? Check in general and only a special one for
changePlayer.