February 2018
Intermediate to advanced
350 pages
7h 35m
English
Content preview from Functional Kotlin
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Either
Either<L, R> is a representation of one of two possible values L or R, but not both at the same time. Either is a sealed class (similar to Option) with two subtypes Left<L> and Right<R>. Usually Either is used to represent results that can fail, using the left side to represent the error and the right side to represent a successful result. Because representing operations that can fail is a common scenario, Arrow's Either is right biased, in other words, unless it is documented otherwise all operations run on the right side.
Let's translate our division example from Option to Either:
import arrow.core.Eitherimport arrow.core.Either.Rightimport arrow.core.Either.Leftfun eitherDivide(num: Int, den: Int): Either<String, Int> { val option ...
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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.