July 2023
Beginner to intermediate
488 pages
14h
English
book
Functional Programming in Scala, Second Edition
by Runar Bjarnason, Michael Pilquist, Paul Chiusano
Content preview from Functional Programming in Scala, Second EditionBecome 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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1 What is functional programming?
This chapter covers
- Understanding the benefits of functional programming
- Defining pure functions
- Referential transparency, purity, and the substitution model
Functional programming (FP) is based on a simple premise with far-reaching implications: we construct our programs using only pure functions —in other words, functions that have no side effects. But what are side effects? A function has a side effect if it does something other than simply return a result. This includes, for example, the following cases:
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Modifying a variable
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Modifying a data structure in place
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Setting a field on an object
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Throwing an exception or halting with an error
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Printing to the console or reading user input
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Reading from ...
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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.