how to keep running a for loop in kotlin code example

Example 1: for loop kotlin

val array = arrayOf(1, 3, 9)
for (item in array) {
    //loops items
}
for (index in 0..array.size - 1) {
	//loops all indices
}
for (index in 0 untill array.size) {
    //loops all indices
}
for (index in array.indices) {
    //loops all indices (performs just as well as two examples above)
}

Example 2: kotlin loop

val school = arrayOf("shark", "salmon", "minnow")
for (element in school) {
    print(element + " ")
}
-> shark salmon minnow

for ((index, element) in school.withIndex()) {
    println("Item at $index is $element\n")
}
-> Item at 0 is shark
Item at 1 is salmon
Item at 2 is minnow

Example 3: kotlin labels

fun onlyPrimes() {
    // You can use labels to specify which loop will skip current iteration

    outer@for (num in 2..100) {
        for (check in 2..(num / 2)) {
            if (num % check == 0) {
                continue@outer
            }
        }
        println(num)
    }
}