Log4s vs Monocle

Log4s

High-performance SLF4J wrapper for Scala. (by Log4s)

Extensions

Source Code

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Monocle

Optics library for Scala (by optics-dev)

Extensions Scala Functional programming Optics Lens Typelevel Cats

Source Code

optics.dev

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Log4s		Monocle
	Project
-	Mentions	5
171	Stars	1,629
-0.6%	Growth	0.1%
2.6	Activity	8.3
2 months ago	Latest Commit	8 days ago
Scala	Language	Scala
GNU General Public License v3.0 or later	License	MIT License

The number of mentions indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.

Log4s

Posts with mentions or reviews of Log4s. We have used some of these posts to build our list of alternatives and similar projects.

We haven't tracked posts mentioning Log4s yet.
Tracking mentions began in Dec 2020.

Monocle

Posts with mentions or reviews of Monocle. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2022-04-12.

Ref in cats-effect. When should I use it, and when should I not?
1 project | /r/scala | 9 Jul 2022

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.
Show HN: Monocle – bidirectional code generation library
10 projects | news.ycombinator.com | 12 Apr 2022

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
Monocle 3 release candidate - a super useful and simple library for optics with poetic api
1 project | /r/scala | 1 Jun 2021

See example https://www.optics.dev/Monocle/
Monocle 3.0.0-M1 is released for Scala 2.13 and Scala 3
1 project | /r/scala | 19 Feb 2021
Monocle 3 Roadmap
3 projects | /r/scala | 21 Jan 2021

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?

When comparing Log4s and Monocle you can also consider the following projects:

Scala-Logging - Convenient and performant logging library for Scala wrapping SLF4J.

Quicklens - Modify deeply nested case class fields

scribe - The fastest logging library in the world. Built from scratch in Scala and programmatically configurable.

Shapeless - Generic programming for Scala

better-files - Simple, safe and intuitive Scala I/O

Chimney - Scala library for boilerplate-free, type-safe data transformations

Resolvable

cats - Lightweight, modular, and extensible library for functional programming.

Freestyle - A cohesive & pragmatic framework of FP centric Scala libraries

Scalaz - Principled Functional Programming in Scala

refined - Refinement types for Scala

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.