July 2023
Beginner to intermediate
488 pages
14h
English
book
Functional Programming in Scala, Second Edition
by Runar Bjarnason, Michael Pilquist, Paul Chiusano
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11 Monads
This chapter covers
- Discussing type constructors
- Introducing functors
- Defining monads
In the previous chapter, we introduced a simple algebraic structure: the monoid. This was our first instance of a completely abstract, purely algebraic interface, and it led us to think about interfaces in a new way. A useful interface may be defined only by a collection of operations related by laws.
In this chapter, we’ll continue this mode of thinking and apply it to the problem of factoring out code duplication across some of the libraries we wrote in parts 1 and 2. We’ll discover two new abstract interfaces—Functor and Monad—and get more general experience with spotting these sorts of abstract structures in our code.1
11.1 Functors: Generalizing ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.