Hi guys :slightly_smiling_face: What would be the most idiomatic way to add 2 elements to a list, on...

# getting-started

[Jérémy CROS]

Hi guys 🙂
What would be the most idiomatic way to add 2 elements to a list, one at the beginning and one at the end?
So far I have listOf(element0) + listOfElements + elementLast
But I’m not sure if there are more efficient / maybe clearer options available ?

[Javier]

I like buildList

val list = buildList {
    add(element0)
    addAll(elements)
    add(elementLast)
}

[Javier]

val list = buildList {
    add(index = 0, element = element0)
    addAll(elements)
    add(index = count(), element = elementLast)
}

That is more explicit

[Klitos Kyriacou]

Do you mean you want to add these two elements to an existing mutable list, or create a new list from the original and the two elements?

[Jérémy CROS]

Second option 🙂
But I very much like @Javier’s proposition, did not know about it, it’s cleaner than what I was doing.
Thanks! 🙂

[Michael Böiers]

Isn’t buildList experimental? It’s not much more complex to do it “manually” 🙂

val listA = listOf("b", "c", "d")
val list = mutableListOf<String>().apply {
    add("a")
    addAll(listA)
    add("e")
}