Data.Bool.Compat

Booleans

data Bool

Constructors

False

True

Instances

Eq Bool

Ord Bool

Read Bool

Operations

(&&) :: Bool -> Bool -> Bool

Boolean "and"

(||) :: Bool -> Bool -> Bool

Boolean "or"

not :: Bool -> Bool

Boolean "not"

otherwise :: Bool

otherwise is defined as the value True. It helps to make guards more readable. eg.

  f x | x < 0     = ...
      | otherwise = ...

bool :: a -> a -> Bool -> a

Case analysis for the Bool type. bool a b p evaluates to a when p is False, and evaluates to b when p is True.

Since: 4.7.0.0