September 2018
Intermediate to advanced
398 pages
9h 43m
English
Content preview from Scala Programming Projects
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Scala class hierarchy
All Scala types extend a built-in type called Any. This type is the root of the hierarchy of all Scala types. It has two direct subtypes:
- AnyVal is the root class of all value types. These types are represented as primitive types in the JVM.
- AnyRef is the root class of all object types. It is an alias for the class java.lang.Object.
- A variable of type AnyVal directly contains the value, whereas a variable of type AnyRef contains the address of an object stored somewhere in memory.
The following diagram shows a partial view of this hierarchy:
When you define a new class, it indirectly extends AnyRef. This being an alias ...
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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.