February 2016
Intermediate to advanced
382 pages
8h 1m
English
Content preview from Scala Design PatternsBecome 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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Polymorphism
Polymorphism is something every developer who has done some object-oriented programming knows about.
Note
Polymorphism helps us to write generic code that can be reused and applied to a variety of types.
It is important to know that there are different types of polymorphism out there, and we will be looking at them in this section.
Subtype polymorphism
This is the polymorphism every developer knows about, and it's related to overriding methods in concrete class implementations. Consider the following simple hierarchy:
abstract class Item { def pack: String } class Fruit extends Item { override def pack: String = "I'm a fruit and I'm packed in a bag." } class Drink extends Item { override def pack: String = "I'm a drink and I'm packed in ...Become 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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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.