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Monocle
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Ref in cats-effect. When should I use it, and when should I not?
Without concurrency, using a Ref doesn't buy you anything over just using a var. If you want the benefits of immutability with an API that resembles mutability, you have to use something like Monocle.
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Show HN: Monocle – bidirectional code generation library
A very popular Scala optics library is also called Monocle. I’ve been a happy user for a few years:
https://github.com/optics-dev/Monocle
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Monocle 3 release candidate - a super useful and simple library for optics with poetic api
See example https://www.optics.dev/Monocle/
- Monocle 3.0.0-M1 is released for Scala 2.13 and Scala 3
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Monocle 3 Roadmap
We always have work to do, for example to define scalfix rules to automate the migration https://github.com/optics-dev/Monocle/issues/1001
What are some alternatives?
ScalaTest - A testing tool for Scala and Java developers
Quicklens - Modify deeply nested case class fields
n-scala - A new Scala wrapper for Joda Time based on scala-time
Shapeless - Generic programming for Scala
Chimney - Scala library for boilerplate-free, type-safe data transformations
Twitter Util - Wonderful reusable code from Twitter
cats - Lightweight, modular, and extensible library for functional programming.
Simulacrum - First class syntax support for type classes in Scala
Scalaz - Principled Functional Programming in Scala
Hamsters - A mini Scala utility library
Scala Graph - Graph for Scala is intended to provide basic graph functionality seamlessly fitting into the Scala Collection Library. Like the well known members of scala.collection, Graph for Scala is an in-memory graph library aiming at editing and traversing graphs, finding cycles etc. in a user-friendly way.