September 2018
Intermediate to advanced
398 pages
9h 43m
English
Content preview from Scala Programming Projects
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Defining an algebraic data type
In order to support variable rates, we need to change the signature of all functions that accept interestRate: Double. Instead of a double, we need a type that can represent either a constant rate or a sequence of rates.
Considering two types A and B, we previously saw how to define a type that can hold a value of type A and a value of type B. This is a product type, and we can define it using a tuple, such as ab: (A, B), or a case class, such as case class MyProduct(a: A, b: B).
On the other hand, a type that can hold either A or B is a sum type, and in Scala, we declare it using a sealed trait inheritance:
sealed trait Shapecase class Circle(diameter: Double) extends Shapecase class Rectangle(width: Double, ...
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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.