rei vs lens

rei

Process lists easily (by kerkomen)

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Source Code

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lens

Lenses, Folds, and Traversals - Join us on web.libera.chat #haskell-lens (by ekmett)

Data Lens

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lens.github.io

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rei		lens
	Project
-	Mentions	4
144	Stars	1,982
-	Growth	-
0.0	Activity	6.8
over 7 years ago	Latest Commit	4 days ago
Haskell	Language	Haskell
MIT License	License	BSD 2-clause "Simplified" 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.

rei

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

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

lens

Posts with mentions or reviews of lens. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2022-12-06.

Haskell Lens Tutorial by Exercises
2 projects | news.ycombinator.com | 6 Dec 2022

They are in fact well structured and not random at all. Take a look at this:
https://github.com/ekmett/lens/wiki/Operators
-- /It puts the state in the monad or it gets the hose again./
1 project | /r/programmingcirclejerk | 22 Sep 2022
How to learn OOP?
1 project | /r/typescript | 4 Sep 2022

A composition of functional operations over Kmett style lenses. Here's the original Haskell implementation, here's usage in JS via Ramda
Dhall: A Gateway Drug to Haskell
27 projects | news.ycombinator.com | 7 Jun 2022

The documentation of lenses is geared towards people know what lenses are. Of course this single fragment of documentation doesn't make sense if you don't know what lenses are. If you want to understand what lenses are the package links to a helpful wiki and tutorial: https://github.com/ekmett/lens/wiki/Overview
All within reach within seconds of discovering the function.