Friday, 29 April 2016

Haskell: Boolean operators

Following are the logical operators supported by Haskell.

Operator
Description
&&
'a && b' returns true if both a, b are True. Else False.
||
'a || b' return False, if both a and b are False, else True.
Not
'not a' Returns True if a is False, True otherwise


*Main> let a = True
*Main> let b = True
*Main> let c = False
*Main> 
*Main> a && b
True
*Main> a && c
False
*Main> 
*Main> a || b
True
*Main> a || c
True
*Main> a || False
True
*Main> c || (10 < 9)
False
*Main> 
*Main> not a
False
*Main> not b
False
*Main> not c
True

Operators are implemented as functions internally.

True && False is represented as '(&&) True False', note that the function name must be enclosed in parenthesis.
*Main> (&&) a b
True
*Main> (&&) a c
False
*Main> 
*Main> (||) a b
True
*Main> (||) a c
True
*Main> (||) a False
True
*Main> (||) c (10 < 9)
False
*Main>




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