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Hi all. This maybe a lame question, but how "heavy" is Arrow Optics? I mean dependency wise, method count wise etc. We are evaluating adding it to our *Android* project (because copy-copy-copy... enough is enough!), but a bit afraid of Arrow size. Never used it before. Also, how will it be performance wise considering Android? I suspect everything will be OK.

Hi <@U0CLKFTD3>, Arrow optics only depends on arrow-core. The last version jar sizes can be seen here:
<https://repo1.maven.org/maven2/io/arrow-kt/arrow-optics/0.13.2/>
<https://repo1.maven.org/maven2/io/arrow-kt/arrow-core/0.13.2/>

You can off course proguard, and when you generate Optics instead of generating all optics you can generate only lenses if all you care about is `copy` boilerplate.

Arrow no longer depends on reflection tricks and proguard should be much easier. Take this with a grain of salt as I’m no Android dev.

core also depends on arrow-continuations but that is a small lib with a couple of types, other than that there should be no other dependencies.

great, thanks for clarification! Seems like it's really worth trying it.

Hey <@U0CLKFTD3>, it’s definitely worth looking into for Android especially if you practice DDD or use a or sealed/data classes.

You can also check out this Thread.

<https://kotlinlang.slack.com/archives/C5UPMM0A0/p1630776769069400>

There is a way to tell the generator to not generate everything.

yep, sealed classes was what prompted this.

Then you’re probably most interested in using the DSL, and then I advice to just let proguard do its thing get rid of he unused code from the generated code.