utility-ht- Various small helper functions for Lists, Maybes, Tuples, Functions




if' :: Bool -> a -> a -> aSource

if-then-else as function.


 if' (even n) "even" $
 if' (isPrime n) "prime" $

ifThenElse :: Bool -> a -> a -> aSource

The same as if', but the name is chosen such that it can be used for GHC-7.0's rebindable if-then-else syntax.

select :: a -> [(Bool, a)] -> aSource

From a list of expressions choose the one, whose condition is true.


 select "boring" $
   (even n, "even") :
   (isPrime n, "prime") :

(?:) :: Bool -> (a, a) -> aSource

Like the ? operator of the C progamming language. Example: bool ?: (yes, no).

implies :: Bool -> Bool -> BoolSource

Logical operator for implication.

Funnily because of the ordering of Bool it holds implies == (<=).