Hello. I have an `object` with constants defined a...

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[Vitali Plagov]

Hello.
I have an object with constants defined as const val. I want to get a list of all constants available in this object. Is there a convenient way to get them? I tried with reflection: MyObjectWithConstant::class.declaredMemberProperties

[Joffrey]

You could define your constants using a property delegate that registers them in a list or map. Something like this:
https://kotlinlang.slack.com/archives/C0B8MA7FA/p1632152724002800?thread_ts=1632151317.001400&cid=C0B8MA7FA

[ephemient]

can't have delegates with const val, so if that's important to you, you'll need to use other approaches like reflection or codegen

[Vitali Plagov]

Thanks! What is “Peter approaches”?

[Joffrey]

Might be an auto-corrected "other" 😄

[Vitali Plagov]

Don’t think that const val is so important

[Vitali Plagov]

Thanks @Joffrey! I think your proposed solution will work for me!

[ephemient]

autocorrect whyyyyy

[ephemient]

anyhow, reflection isn't too hard:

MyObjectWithConstant::class.declaredMemberProperties.filter { it.isConst }.associate { it.name to it.call() }

but does have a downside of being limited to JVM only

[ephemient]

the delegate trick is interesting, you might want to make it private so nobody else can mess with it. I'd probably choose to do something with kapt/ksp to generate a table of constants at compile-time if I had to (it would work with const too)