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kotlinlang

<https://www.reddit.com/r/androiddev/comments/8n7c6n/easy_handling_of_immutable_data_and_sealed_class/>

I’ve not spent much time with the optics in Arrow, but is it possible to compose lenses? Pseudocode, so usual warnings apply:

`@optics data class Thing(str: String, num:Int)`

`val mark = Thing.str.modify( it + "!")`
`val inc = Thing.num.modify( it + 1)`

`val combinedLens = mark.pipe(inc)`

Yes, all of them have a `compose` method and have a composition table and everything. That’s their main use case :smile: See <https://arrow-kt.io/docs/optics/optional/#composition> for example

<https://arrow-kt.io/docs/optics/getter/#composition>