Haskell Following the three ways to define "&&" on slides 6--7 of chapter 4,show the analogous three ways how the disjunction operator "||" can bedefined using pattern matching. Functions can often be defined in many differentways using pattern matching. For example(&&) :: Bool → BoolTrue && True = TrueTrue && FalseFalse && TrueFalse && FalseNote:FalseFalse= Falsecan be defined more compactly byTrue && True = True&&False=BoolHowever, the following definition is more efficient,because it avoids evaluating the second argumentif the first argument is False:True && b = bFalse && = FalseThe underscore symbol is a wildcard patternthat matches any argument value.

Answered: Haskell Following the three ways to…

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

Section: Chapter Questions

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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.

Expert Solution

Step 1

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

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

True || True = True

True || False = True

False || True = True

False || False = False

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