Is there a Kotlin "idiomatic" one-liner counterpar...

# announcements

[Kirill Grouchnikov]

Is there a Kotlin "idiomatic" one-liner counterpart of Java's Collections.unmodifiableList?

[CLOVIS]

What you want is probably available in kotlinx.immutable

[CLOVIS]

Other than that, Collections.unmodifiableList() gives a read-only list, not immutable. To get an easy thin read-only wrapper, you can write:

data class ReadOnlyList<T>(private val list: List<T>) : List<T> by list

fun <T> List<T>.asReadOnly() = ReadOnlyList(this)

I wish it was added to the standard library, but at least that's only 2 lines of code so it's really not a big deal.