lens-errors VS microlens

Compare lens-errors vs microlens and see what are their differences.


Handling errors which occur deep inside lens-chains (by ChrisPenner)


A lightweight (but compatible with ‘lens’) lenses library (by stevenfontanella)
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lens-errors microlens
- 2
17 284
- 1.1%
0.0 7.5
almost 5 years ago 25 days ago
Haskell Haskell
BSD 3-clause "New" or "Revised" License BSD 3-clause "New" or "Revised" 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.


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

We haven't tracked posts mentioning lens-errors yet.
Tracking mentions began in Dec 2020.


Posts with mentions or reviews of microlens. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2022-09-03.
  • [Offer] Tutoring for Computer Science / Programming / Software Engineering topics
    2 projects | /r/tutor | 3 Sep 2022
    I'm a software engineer with 3 years of professional experience. I worked for 2 years at Microsoft on Azure Compute and now work at Google, working on improving Google search. I am the sole maintainer of the popular open-source library microlens with 80k downloads. I've also contributed to the Koka programming language developed at Microsoft Research.
  • microlens is looking for a new maintainer
    2 projects | /r/haskell | 8 May 2022
    microlens is a tiny van Laarhoven lenses library, mostly just copying definitions from lens and trying to avoid dependencies as much as possible. It has gained some popularity (742 package downloads in the last 30 days, vs the 1724 of the original lens).

What are some alternatives?

When comparing lens-errors and microlens you can also consider the following projects:

polysemy-optics - Optics for Polysemy.

data-lens - Haskell 98 Lenses

vitrea - Optics via the profunctor representation theorem

cassava-conduit - Conduit interface for cassava [Haskell]

fclabels - First class composable record labels for Haskell.

syb-with-class - Fork of http://patch-tag.com/r/Saizan/syb-with-class

bimap - Bidirectional mapping between two key types

buffer-builder - Haskell library for efficiently building up buffers


proto-lens - API for protocol buffers using modern Haskell language and library patterns.

base64-bytestring - Fast base64 encoding and decoding for Haskell.