The Parallel typeclass in Cats - Scala tutorial

Описание: In this video, you'll learn about the Parallel typeclass: what problem it solves, how it's implemented in Cats, and how it can be used in your programs. You'll also see what the relationship between Either and Validated is and why they are distinct types.

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Examples (mostly non working snippets, but could help for copy-pasteability): https://github.com/kubukoz/videos/blo...

Table of contents:

0:00 - Introduction, a bit of history
0:51 - Case study: Either accumulation
4:01 - Case study: IO parallelism
5:31 - Looking for a common abstraction
6:42 - Possible solution: Applicative?
7:15 - The problem with Applicative
7:48 - Introducing Parallel
10:57 - Final result
11:31 - NonEmptyParallel
12:08 - Summary, parting words

If you want more:
Parallel documentation: https://typelevel.org/cats/typeclasse...
IO parallelism: https://typelevel.org/cats-effect/dat...
Validated documentation: https://typelevel.org/cats/datatypes/... - in there you'll find withEither, which is another way of temporarily converting Validated to Either.Either, Validated, and Parallel (blog) - https://timushev.com/posts/2019/09/24...
Why Parallel (blog) - https://meta.plasm.us/posts/2019/09/1...