December 2018
Intermediate to advanced
376 pages
12h 1m
English
Content preview from Swift in DepthBecome 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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Chapter 10. Understanding map, flatMap, and compactMap
This chapter covers
- Mapping over arrays, dictionaries, and other collections
- When and how to map over optionals
- How and why to flatMap over collections
- Using flatMap on optionals
- Chaining and short-circuiting computations
- How to mix map and flatMap for advanced transformations
Modern languages like Swift borrow many concepts from the functional programming world, and map and flatMap are powerful examples of that. Sooner or later in your Swift career, you’ll run into (or write) code that applies map and flatMap operations on arrays, dictionaries, and even optionals. With map and flatMap, you can write hard-hitting, succinct code that is immutable—and therefore safer. Moreover, since ...
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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.