How to clone object in Kotlin?

Dims picture Dims · Mar 1, 2018 · Viewed 48.3k times · Source

The Kotlin documentation describes cloning only in accessing Java and in enum class. In latter case clone is just throwing an exception.

So, how would I / should I clone arbitrary Kotlin object?

Should I just use clone() as in Java?

Answer

yole picture yole · Mar 1, 2018

For a data class, you can use the compiler-generated copy() method. Note that it will perform a shallow copy.

To create a copy of a collection, use the toList() or toSet() methods, depending on the collection type you need. These methods always create a new copy of a collection; they also perform a shallow copy.

For other classes, there is no Kotlin-specific cloning solution. You can use .clone() if it suits your requirements, or build a different solution if it doesn't.