October 2019
Intermediate to advanced
434 pages
11h 54m
English
Content preview from Mastering Kotlin
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When should we use a companion object?
You may be wondering when you may want to use a companion object. A few examples of when to use a companion object include the following:
- Writing factory methods for classes with private constructors
- Providing static constants and methods
- Scoping top-level properties and functions
Companion objects have access to the private properties, methods, and constructors of the enclosing class. This means that if a class has a private constructor, its companion object can still instantiate instances of the enclosing class. This allows you to write factory methods on a companion object to control how a class is created.
While Kotlin generally prefers top-level functions and properties, it's possible to leverage ...
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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.