is this

for (i in 1 until array.size)

the best equivalent to this?

for num in array[1:]

what kind of "best" function are we using here? readability? performance? minimum code length?

literal translation, the sample below is python

there is an

drop(1)

function, which copies whole iterable except the first x members (unless it's a sequence, in sequence it works 👌)

ok so the one I suggested in the beginning i guess is the most readable

or you could turn into functional style:

array.asSequence()
    .drop(1)
    .map { ... }
    .forEach { ... }

Re:

ok so the one I suggested in the beginning i guess is the most readable

I think

for (num in array.drop(1))

is more readable because you can use

num

directly for each element, instead of

array[i]

. But it's a matter of opinion; do what's more readable for you and your colleagues or whoever reads your code.

val array = intArrayOf(1, 2, 3)
array.sliceArray(1 until array.size)

on the JVM at least, sticking with arrays instead of dropping to sequences or lists is going to be a massive performance gain

thanks