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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13 External effects and I/O
This chapter covers
- Contrasting effects and side effects
- Introducing trampolining
- Discussing free monads
- Defining capability traits
In this chapter, we’ll take what we’ve learned so far about monads and algebraic data types and extend it to handling external effects, like reading from databases and writing to files. We’ll develop a monad for I/O, aptly called IO, that will allow us to handle such external effects in a purely functional way.
We’ll make an important distinction in this chapter between effects and side effects. The IO monad provides a straightforward way of embedding imperative programming with I/O effects in a pure program, while preserving referential transparency. It clearly separates effectful
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.