0:00 / 0:00
Haskell Lenses From Scratch
The Haskell Goose
300 subscribers • 1 video on Hallway
- Recommended by 2 people: 1 on Lobsters and 1 in engineering communities.
- A classic. People kept recommending it from 2021 to 2025.
Intermediate. Assumes working knowledge.
9.5K views5 years ago2 recommendations
Programming languagesSoftware designHaskellFunctional programming
How to implement Haskell lenses from scratch to understand how they work under the hood.
Learn how you might go about implementing Haskell lenses yourself.Why it's here
2 people recommend thisWhat people say. Recommended as a clear, step-by-step guide to understanding and implementing Haskell lenses from first principles.
u/jumpy_flamingoin r/haskell • Mentions
What is this tool used in this video?
Hello, I was watching this YouTube video about lenses and saw that the presenter was using some realtimer linter/compiler tool: https://i.imgur.com/50gjrMR.png
Does anyone know what this is? Looks very useful.
u/SenoraRatonin r/haskell • Mentions
On “What after basics of Mondads ?”
> Lens, - a library. If you want you can quickly learn the when and why from the main page of the docs, and then learn as you go by example and feel
To be pedantic, lenses themselves are just a structure that allows you to access type fields, you can write your own lenses. Usually you just use a library and template Haskell to generate them.
link to this video