Hi all Could someone please tell me, how can I make the following code more elegant:

class GenderMapper(val id: String, val description: String)

fun GenderMapper.toGender(): Gender {
    val description = this.description
    return Gender.new(id) {
        this.description = description
    }
}

You can use

return Gender.new(id) {
        this.description = this@toGender.description
    }

Could you please explain the code

It tells the compiler which

this

you mean. in the lambda scope you have multiple

this

values available: 1. in the lambda, which seems to be defined as

Gender.() -> Gender

you have the

Gender

object as

this

2. in the extension function scope you have the

GenderMapper

object. If you just write

this

it will default to the innermost context. But Kotlin also allows you to access the other scopes. Each scope is given a name, which is by default the method name that comes right before you open the block. So when setting the description here,

this

givey sou the

Gender

and

this@toGender

gives you the

GenderMapper

. This naming mechanism can also be used for returning out of lambdas (assuming you're working with inline functions). E.g. if you're inside a lambda for a call inside a forEach loop and want to jump out of this loop run (like

continue

, you can

return@forEach

. If things get too complicated, you can also give each scope a different name like this:

myMultilevelList.forEach outerLoop@{ innerList ->
    innerList.forEach {
       if (it.hasError) return@outerLoop
    }
}

@Tobias Berger Could you please show me, how to do it?