base-3.0.2.0: Basic librariesSource codeContentsIndex
Data.Bool
Portabilityportable
Stabilityexperimental
Maintainerlibraries@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 Source
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
show/hide Instances
Operations
(&&) :: Bool -> Bool -> BoolSource
Boolean "and"
(||) :: Bool -> Bool -> BoolSource
Boolean "or"
not :: Bool -> BoolSource
Boolean "not"
otherwise :: BoolSource

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

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