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The best way to understand lenses is to implement it yourself. It's best if you do it in a language you're entirely comfortable in, not necessarily an FP language. For example, here's an implementation in JavaScript. And that guy also has a lot of resources on how he wrote it.
That just gave me another reason to try to create my own version of the Arrow library in Kotlin! I didn't really like the names given to some of the types there. 😅 This can also serve as a way for me to learn Optics and the FX side of the library too! (And maybe I can even try my hand at implementing persistent data structures!)
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