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? — s1m0nw1
– s1m0nw1, Commented Oct 19, 2017 at 4:35

Ammar · Accepted Answer · 2017-10-19 01:04:28Z

60

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

addAttributes(*atts)

This worked.

answered Oct 19, 2017 at 1:04

Ammar

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1 Comment

What about the opposite? If I have varargs of string, and I want to pass as an array of strings?

Ali Nawaz · Accepted Answer · 2022-06-12 12:14:02Z

5

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, 2022 at 12:14

Ali Nawaz

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Amir Hossein · Accepted Answer · 2022-05-24 17:33:13Z

1

you have two ways:

answered May 24, 2022 at 17:33

Amir Hossein

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