Pass an Array to varargs parameter

Question

If I have a function header like:

fun addAttributes(vararg attributes: String) {
  ...
}

And I want to pass attributes in here:

val atts = arrayOf("1", "2", "3")
addAttributes(atts)

It gives a compilation error about incompatible types. What should I do?

Possible duplicate of [How to pass a kotlin collection as varagrs?](https://stackoverflow.com/questions/46418550/how-to-pass-a-kotlin-collection-as-varagrs) — s1m0nw1, Oct 19 '17 at 04:35

score 54 · Accepted Answer · answered Oct 19 '17 at 01:04

54

I used the spread operator that basically spreads the elements to make them compatible with varargs.

addAttributes(*atts)

This worked.

answered Oct 19 '17 at 01:04

Ammar

What about the opposite? If I have varargs of string, and I want to pass as an array of strings? – android developer Oct 07 '19 at 10:39

score 4 · Answer 2 · answered Jun 12 '22 at 12:14

4

If you have an array then make it like:

addAttributes(*arrayVar)

If you have a list then in that case:

addAttributes(*listVar.toTypedArray())

answered Jun 12 '22 at 12:14

Ali Nawaz

score 1 · Answer 3 · answered May 24 '22 at 17:33

1

you have two ways:

answered May 24 '22 at 17:33

Amir Hossein

3 Answers3