guys, I need to iterate over some collection but n...

# announcements

[evkaky]

guys, I need to iterate over some collection but not from first index, and I don’t want to deal with indices at all.
I know, in python there is an enumerate(arr, fromId) built-in function for that purpose:

for elem in enumerate(arr, 2): // elem = arr[2], arr[3] ... arr[n-1]

Is there something like that in kotlin std lib?

[gjesse]

evkaky: you could write an extension function that does this for you if there isn’t one

[gjesse]

kotlin

fun <T> Iterable<T>.enumerate(startIdx: Int): Iterable<T> {
    return this.filterIndexed { index, t -> index >= startIdx }
}

[gjesse]

then you can do

listOf(0,1,2,3,4)
            .enumerate(2)
            .forEach {
                println(it)
            }

[gjesse]

or you could just use filterIndexed directly 🙂

[marstran]

You can use for (n in arr.drop(2)) { .. ]