https://github.com/fumieval/witherable

Filter with effects
https://github.com/fumieval/witherable

Last synced: about 1 year ago
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Filter with effects

• Host: GitHub
• URL: https://github.com/fumieval/witherable
• Owner: fumieval
• Created: 2014-12-05T05:50:40.000Z (over 11 years ago)
• Default Branch: master
• Last Pushed: 2025-01-05T12:06:25.000Z (over 1 year ago)
• Last Synced: 2025-05-09T14:35:29.169Z (about 1 year ago)
• Language: Haskell
• Homepage: http://hackage.haskell.org/package/witherable
• Size: 158 KB
• Stars: 73
• Watchers: 8
• Forks: 29
• Open Issues: 10
• Metadata Files:
  • Readme: README.md

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README

          
# witherable

[![Discord](https://img.shields.io/discord/664807830116892674?color=%237095ec&label=Discord&style=plastic)](https://discord.gg/DG93Tgs)

witherable-class defines `Filterable` and `Witherable` class with instances.

witherable provides indexed variants, optic-style generalised withers and extra instances.

Why not just `fmap catMaybes . traverse f`? Because `wither` can be defined to traverse the structure once. Also, its parametrity ensures that filtering works in a sane way. For more details, see also [FilterableとWitherableについて](https://viercc.github.io/blog/posts/2021-10-24-witherable-1.html)

Dependencies:

* base-orphans

* containers

* hashable

* transformers

* unordered-containers

* vector