Beginner lens / optics questions and points of confusion
mrkgnao opened this issue · 3 comments
If there's something about optics you don't understand, please talk a little about it below.
Format
Include:
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the language you're using (Haskell, PureScript, Scala, or something else?)
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the library or implementation you're using (e.g. lens, microlens, or mezzolens for Haskell, purescript-profunctor-lenses for PureScript, ...)
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how much experience you have with the language
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as much other information as possible!
Code samples, type errors, and so on are also good if you have some.
All levels of experience welcome!
The process
Project maintainers will leave a 👍 reaction to indicate that we understand your question and that it has been added to a list.
This will help keep the issue free of useless "good point!" comments. If we have any further clarifications to ask for, we will do so.
Credits
@modernserf suggested we do this, i.e. collect questions that beginners are likely to have.
Current list
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I know what lenses are, but what about the other optics? - @modernserf
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What are lenses for? - @Kansattica
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What are the alternative implementations to choose from, why are there so many, and what are the differences between them? - @Kansattica
As an absolute Haskell beginner, what problem does this solve? Why would I want to use one of these libraries, and why are there so many of them to choose from?
How are lenses different from getters/setters in OO languages? They do look very much similar.
Are there any "lens laws"?