Hey guys, I've implemented a custom annotation to be used on functions but I haven't found anything that shown how can I process this annotations. My goal with this is use the annotation on the function as meta info to pre-run the functions before execute other parts of my code creating dynamic "callback". You guys can point out any part of Kotlin doc that cover this kind of stuff? By now I've found this part of the doc https://kotlinlang.org/docs/reference/annotations.html but I still don't get how can I process the annotation.

@jackmiras https://github.com/JetBrains/kotlin-examples/tree/master/gradle/kotlin-code-generation There is an example of kapt there

I'm trying to build global implicits to support typeclass lookups in Kotlin and let me tell you the support for kotlin stuff is non existent, just works as a regular java annotation processor.

Hello all, does Kotlin perform recursive equals in data objects which contains other sub data objects? it does not invoke those sub-object’s equals, right? What does Kotlin do with those sub-data objects? It seems it does basic first-level Equality including basic types and excluding other relations.

it simply invokes

.equals

on every member of the data class, and other data classes should have

.equals

implemented the same way, so it should essentially be doing a "recursive equals" as you're saying

@kevinmost is that true for inherited members?

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@kevinmost you were right, I must have something wrong in my app. Thanks for that!

Is there any way to omit a value from toString in a data class?

I have a user class which has kind of sensitive data I don’t want to appear in toString

Need to write the

toString

yourself, IntelliJ can generate it.

you could make your data class into an AutoValue class and use the redacted extension. Alternatively you could make yourself a wrapper for sensitive strings?

data class RedactedString(val value: String) {
    override fun toString() = "redacted"
}

Kind of a bad solution, but i think you can also not make sensitive data part of the primary constructor of said data class, that way it won't be used in equals, hash or toString

I would love to see a warning when a method / construtor was called with a boolean parameter but without named arguments

hi guys, i wonder, I have a

List<Data

with

data class Data(val a: String, val b: String)

, is there an operator to split the list into two lists (one with all the a value and one with all the b value) ?

hum not really what I want (split the list in two with a predicate, but my Data have both a and b values)

you gonna have to filter yourself

cause you have a condition

you should see a doctor for that condition

yeah, I think I will do 2 map because there is only few items in my list, but wondered if it was possible

well it is, with filter

I think using RxJava that might be possible to do it in a one liner

just 1 more step than what you’re asking, defining the condition

but i don’t have a condition

no filter

you said one with all the a value, and one with all the b value

that’s a condition you want to split according to, no?

not a condition

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