Programming
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You're reading from  Soar with Haskell

Product typeBook
Published inDec 2023
Reading LevelBeginner
PublisherPackt
ISBN-139781805128458
Edition1st Edition
Languages
Haskell
Concepts
Programming Language
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Author (1)
Tom Schrijvers
Tom Schrijvers
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Tom Schrijvers

Tom Schrijvers is a professor of computer science at KU Leuven in Belgium since 2014, and previously from 2011 until 2014 at Ghent University in Belgium. He has over 20 years of research experience in programming languages and has co-authored more than 100 scientific papers. Much of his research focuses on functional programming and on the Haskell programming language in particular: he has made many contributions to the language, its ecosystem and applications, and chaired academic events like the Haskell Symposium. At the same time, he has more than a decade of teaching experience (including functional programming with Haskell) and received several teaching awards.
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Type class instances

The set of types that instantiates the Eq type class is not fixed. As programmers, we can extend it with additional types.

Type class instantiation

As we saw in the What is ad hoc polymorphism? section, the Suit data type does not instantiate the Eq type class and therefore does not support (==) and (/=). We can remedy that by writing our own instance for it:

instance Eq Suit where
  Hearts   == Hearts   = True
  Diamonds == Diamonds = True
  Spades   == Spades   = True
  Clubs    == Clubs    = True
  _        == _        = False
  Hearts   /= Hearts   = False
  Diamonds /= Diamonds = False
  Spades   /= Spades   = False
  Clubs...
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Soar with Haskell
Published in: Dec 2023Publisher: PacktISBN-13: 9781805128458
© 2023 Packt Publishing Limited All Rights Reserved

Author (1)

author image
Tom Schrijvers

Tom Schrijvers is a professor of computer science at KU Leuven in Belgium since 2014, and previously from 2011 until 2014 at Ghent University in Belgium. He has over 20 years of research experience in programming languages and has co-authored more than 100 scientific papers. Much of his research focuses on functional programming and on the Haskell programming language in particular: he has made many contributions to the language, its ecosystem and applications, and chaired academic events like the Haskell Symposium. At the same time, he has more than a decade of teaching experience (including functional programming with Haskell) and received several teaching awards.
Read more about Tom Schrijvers

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