I am trying to implement the data type LExpr as an instance of show.

data LExpr = Var String        
                | App LExpr LExpr   
                | Lam String LExpr 

This is my code:

 instance Show LExpr where
      showsPrec d (Var str)   = showString' str
      showsPrec d (App e1 e2) = showParen (d>=6) $ showsPrec 6 e1  . showString " " . showsPrec 5  e2
      showsPrec d (Lam str e) = showParen (d>=5) $ showString ("\\"++str++" -> ") . showsPrec 5 e

I am looking for some advice on how to further improve my code.


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Browse other questions tagged or ask your own question.