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Kotlin

Loops

Kotlin's for loop steps through a range or collection directly: for (i in 1..5) includes both endpoints.

Example: summing an inclusive range

fun main() {
    var total = 0
    for (i in 1..5) {
        total += i
    }
    println("Total: $total")
}
Total: 15

1..5 is a range literal that includes both 1 and 5 — compare Swift's very similar 1...5 in the Swift subject of this tutorial, or a plain for (int i = 1; i <= 5; i++) in Java or C#, which achieves the identical result with more ceremony.

Example
fun main() {
    var total = 0
    for (i in 1..5) {
        total += i
    }
    println("Total: $total")
}
Output
Total: 15
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