January 2017
Intermediate to advanced
420 pages
9h 25m
English
Content preview from Programming KotlinBecome 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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Nothing type
In Chapter 2, Kotlin Basics we briefly touched on the Kotlin type hierarchy. The notion of a Nothing type was mentioned: A type that is the subtype of all other types, in a similar vein to how Any is a superclass of all types. The idea of a Nothing type is nothing new (pun intended) for those who have used a functional language, such as Scala. For those who are new to the idea, we will cover why such a type is useful.
The first use case is to indicate that a function would never complete normally. What we mean by normally is that it is not expected to return a value. It may intentionally perform an infinite loop, only ending when the process or thread is killed, or it may only return by throwing an exception. For example, the error ...
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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.