CODEWITHSUNDEEP
stringvariableskotlin
Babbara
Babbara

Reputation: 488

Return an Array<out String>? in Kotlin

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?

Upvotes: 1

Views: 3569

Answers (1)

Chrisvin Jem
Chrisvin Jem

Reputation: 4060

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()
}

Upvotes: 1

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