July 2023
Intermediate to advanced
670 pages
17h 13m
English
Content preview from Effective HaskellBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Summary
In this chapter, you learned about the Functor, Applicative, and Monad type classes, and how to work with lawful type classes. You’ll work with these type classes regularly, so getting a good understanding of how they work and why they work they way they do is useful. Of equal importance, in this chapter you got a chance to see first hand how to design and implement type classes that have a wide variety of uses with highly divergent behavior that still adhere to the basic laws of the classes.
Later on in this book you’ll build your own parser and define new Functor, Applicative, and Monad instances for a brand new type of computation. After that, you’ll learn how build new Monad instances by composing the behaviors of existing instances ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.