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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Limitations
For now, you cannot inherit another class when defining a data class. To avoid delaying the 1.0 release, the makers of Kotlin have decided to have this restriction to avoid the problems that would be caused by this. Imagine a data class, Derived, inherits from a data class, Base; if this happens, then these questions need to be answered:
- Should an instance of Base be equal to an instance of Derived if they have the same values for all the shared fields?
- What if I copy an instance of Derived through a reference of the type Base?
I am sure, in the future, all the limitations will be addressed and we would be able to write code similar to this (the Scala developer would be familiar with the construct of Either):
sealed abstract class Either<out ...
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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.
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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.