schema vs lens

schema

Encoding-independent schemas for Haskell data types (by TokTok)

Data Tox

Source Code

hackage.haskell.org

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lens

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

Data Lens

Source Code

lens.github.io

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schema		lens
	Project
-	Mentions	4
3	Stars	1,986
-	Growth	-
5.6	Activity	7.0
4 months ago	Latest Commit	8 days ago
Haskell	Language	Haskell
GNU General Public License v3.0 only	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.

schema

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

We haven't tracked posts mentioning schema 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.

What are some alternatives?

When comparing schema and lens you can also consider the following projects:

avro - Haskell Avro Encoding and Decoding Native Support (no RPC)

proxy - proxy 'helpers'

Frames - Data frames for tabular data.

algebraic-classes - Conversions between algebraic classes and F-algebras.

binary - Efficient, pure binary serialisation using ByteStrings in Haskell.

proxy - This repository contains the WhatsApp proxy implementation for users to host their own proxy infrastructure to connect to WhatsApp for chat (VoIP is not currently supported)

semantic-source - Parsing, analyzing, and comparing source code across many languages

RFC1751 - RFC-1751 library for Haskell

hexml-lens - Lenses for working with XML data

double-metaphone

minst-idx - Read and write data in the IDX format used in e.g. the MNIST database