Return an Array<out String>? in Kotlin

Question

I'm trying to read a list of string from a file, which is structured as a list:

ElemA
ElemB
ElemC

I need to save into this variable, which is defined as:

private var history: Array<out String>?

I made this method, but it doesn't works because it requires an Array? as output, but it founds an Array<(out) Any!>!

private fun loadHistory(): Array<out String>? {
    val list = ArrayList<String>()
    File("history").forEachLine { list.add(it) }
    return list.toArray()
}

How can I solve?

stackoverflow.com/questions/45866466/…

IntelliJ Amiya
– IntelliJ Amiya

2020-05-03 13:21:59 +00:00
Commented May 3, 2020 at 13:21 — IntelliJ Amiya
– IntelliJ Amiya, Commented May 3, 2020 at 13:21
Try using list.toTypedArray() instead of list.toArray()

jsamol
– jsamol

2020-05-03 13:33:39 +00:00
Commented May 3, 2020 at 13:33 — jsamol
– jsamol, Commented May 3, 2020 at 13:33

Chrisvin Jem · Accepted Answer · 2020-05-03 13:56:03Z

1

As suggested by @jsamol in the comments.

You should use toTypedArray() instead of toArray() to get an array of the specific type.(ref)

toArray() returns new array of type Array<Any?>. (ref)

private fun loadHistory(): Array<out String>? {
    val list = ArrayList<String>()
    File("history").forEachLine { list.add(it) }
    return list.toTypedArray()
}

answered May 3, 2020 at 13:56

Chrisvin Jem

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