Moduleutility-ht-0.0.17.2Haskell98

Data.Bool.HT

valueif' :: Bool -> a -> a -> a

if-then-else as function.

Example:

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

valueifThenElse :: Bool -> a -> a -> a

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.

valueselect :: a -> [(Bool, a)] -> a

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

Example:

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

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

Like the ? operator of the C progamming language.

Example2 expressions

>>> True ?: ("yes", "no")"yes">>> False ?: ("yes", "no")"no"

valueimplies :: Bool -> Bool -> Bool

Logical operator for implication.

Funnily because of the ordering of Bool it holds:

Property

prop> \a b -> implies a b == (a<=b)