I don't really think that's better though.

Roughly looks like more efficient, because less allocations, only one list object instead of IntRange + List

And 300 invocations of a lamba. A range might have a more efficient way to convert itself to a list. Haven't checked though

That's inline, right? No lambda actually exists at runtime.

@jstuyts-squins This lambda is inlined, in bytecode and on runtime you will have ArrayList and int loop

Great, but

List(300) { it }

does not work. I have look for other variants, but did not find any, except for

Array(300) { it }

What do you mean "doesn't work"? It works for me, what version of Kotlin are you on?

@jstuyts-squins Works perfectly - https://try.kotlinlang.org/#/UserProjects/ja3te7p41bavd5jk1l2q24sk56/9fcvq4126gbh5ttm2vjdksl99s maybe you use Kotlin 1.0.* instead of 1.1

Sorry for the confusion. It seems try.kotlinlang.org decided to lower the language version