Haskell Hierarchical Libraries (base package)ContentsIndex
Data.Bool
Portability portable
Stability experimental
Maintainer libraries@haskell.org
Contents
Booleans
Operations
Description
The Bool type and related functions.
Synopsis
data Bool
= False
| True
(&&) :: Bool -> Bool -> Bool
(||) :: Bool -> Bool -> Bool
not :: Bool -> Bool
otherwise :: Bool
Booleans
data Bool
The Bool type is an enumeration. It is defined with False first so that the corresponding Enum instance will give fromEnum False the value zero, and fromEnum True the value 1.
Constructors
False
True
Instances
IArray UArray Bool
Ix ix => Eq (UArray ix Bool)
Ix ix => Ord (UArray ix Bool)
(Ix ix, Show ix) => Show (UArray ix Bool)
MArray (STUArray s) Bool (ST s)
MArray IOUArray Bool IO
Typeable Bool
Storable Bool
Ix Bool
Eq Bool
Ord Bool
Bounded Bool
Enum Bool
Read Bool
Show Bool
Random 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 = ...
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