androidkotlin

Kotlin - Most idiomatic way to convert a List to a MutableList

I have a method (getContacts) that returns a List<Contact> and I need to convert this result to a MutableList<Contact>. Currently the best way I can think of doing it is like this:

val contacts: MutableList<Contact> = ArrayList(presenter.getContacts())

Is there a more idiomatic/"less Java" way to do that?

Solution

  • Consider using the toMutableList() function:

    presenter.getContacts().toMutableList()

    There are toMutableList() extensions for the stdlib types that one might want to convert to a mutable list: Collection<T>, Iterable<T>, Sequence<T>, CharSequence, Array<T> and primitive arrays.