Haskell Following the three ways to define "&&" on slides 6--7 of chapter 4, show the analogous three ways how the disjunction operator "||" can be defined using pattern matching.

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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Haskell Following the three ways to define "&&" on slides 6--7 of chapter 4, show the analogous three ways how the disjunction operator "||" can be defined using pattern matching.
Functions can often be defined in many different
ways using pattern matching. For example
(&&) :: Bool → Bool
True && True = True
True && False
False && True
False && False
Note:
False
False
= False
can be defined more compactly by
True && True = True
&&
False
=
Bool
However, the following definition is more efficient,
because it avoids evaluating the second argument
if the first argument is False:
True && b = b
False && = False
The underscore symbol is a wildcard pattern
that matches any argument value.
Transcribed Image Text:Functions can often be defined in many different ways using pattern matching. For example (&&) :: Bool → Bool True && True = True True && False False && True False && False Note: False False = False can be defined more compactly by True && True = True && False = Bool However, the following definition is more efficient, because it avoids evaluating the second argument if the first argument is False: True && b = b False && = False The underscore symbol is a wildcard pattern that matches any argument value.
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Step 1

The three ways how the disjunction operator "||" can be defined using pattern matching:

1.

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

True || True = True

True || False = True

False || True = True

False || False = False

 

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