September 2018
Intermediate to advanced
398 pages
9h 43m
English
Content preview from Scala Programming Projects
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Laws
Given a type F that has a Monad[F] instance, for all types A given an instance fa: F[A], the following equalities must be verified:
- All of the laws from the super traits: See Applicative, Apply, and Functor.
- FlatMap associativity: Given two types B and C, and two functions f: A => F[B] and g: B => F[C], the following applies:
((fa flatMap f) flatMap g) == (fa flatMap(f(_) flatMap g))
- Left identity: Given a type B, a value a: A, and a function f: A => F[B], the following applies:
Monad[F].pure(a).flatMap(f) == f(a)
Bringing a value in the F context and calling flatMap f should provide the same result as calling the function F directly.
- Right identity:
fa.flatMap(Monad[F].pure) == fa
The fa object should not change when we call ...
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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.