Any reason for not having something like this in t...

# getting-started

[jean]

Any reason for not having something like this in the standard library?

private fun <T> MutableList<T>.addAll(vararg element: T) = element.forEach { add(it) }

It’s only possible to pass a collection, an array, an iterable or a sequence as far as I can see. Which is not idealistic when I want to do something like this

val list = MutableList<Int>()
when {
  someReason() -> list.addAll(1, 2, 3)
  someOtherReason() -> list.addAll(4, 5, 6)
}

[Adam S]

I think you want buildList {} https://kotlinlang.org/docs/constructing-collections.html#create-with-collection-builder-functions

[ephemient]

Jean, that extension leads to

val listOfLists = mutableListOf<List<*>>()
listOfLists.addAll()
listOfLists.addAll(emptyList())
listOfLists.addAll(emptyList(), emptyList())

behaving inconsistently

[ephemient]

also varargs are just actually passed as arrays, so your extension is really the same function as the existing MutableCollection<T>.addAll(elements: Array<T>), just with different syntax

list.addAll(arrayOf(1, 2, 3))
list.addAll(arrayOf(4, 5, 6))

[ephemient]

after https://youtrack.jetbrains.com/issue/KT-43871 you should be able to write

list.addAll([1, 2, 3])
list.addAll([4, 5, 6])

[jean]

I just wanted to avoid having to wrap my actual values

list.addAll(
    [
        SomeValue.builder()
          ...
        .build(),
        ...
    ]
)

[ephemient]

if that's what you're doing, I don't see what you're getting out of addAll as opposed to

list.add(SomeValue.builder()....build())
list.add(...)