Poker hands

We can use the allPairs function to do things like generate poker hands. In MCPrelude we have defined two lists called cardRanks and cardSuits. Try calling your allPairs function on these:

allPairs cardRanks cardSuits == [(2,"H"),(2,"D"),(2,"C"),(2,"S"),(3,"H"),(3,"D"),(3,"C"),(3,"S"),(4,"H"),(4,"D"),(4,"C"),(4,"S"),(5,"H"),(5,"D"),(5,"C"),(5,"S")]

But this isn’t a very nice representation. We want a more concise representation of the card to show our user. If you were writing a real poker-related program, instead of using a tuple you would probably create a data type Card. Do that now and then write a Show instance for it that returns the more concise representation "2H", "2D", etc.

show (Card 2 "h") == "2h"

Now create a new function allCards that does the same thing as your allPairs function but uses your new Card data type instead. It should have the following type signature:

allCards :: [Int] -> [String] -> [Card]

This function should do the same thing as allPairs, but with more concise output. When you write this function, don’t implement it using your previous allPairs function. Rewrite it.

show (allCards cardRanks cardSuits) == "[2H,2D,2C,2S,3H,3D,3C,3S,4H,4D,4C,4S,5H,5D,5C,5S]"

Previous Page - Next Page