How to write for loop in Kotlin

Question

What is the equivalent code of this version of for loop in Kotlin?

for(int i = 0; i < 5 ; i++) {
    //Body            
}

Next time please 1) Look into the documentation 2) Ask a question on SO, not the other way around — Egor, Feb 09 '19 at 14:24

score 0 · Answer 1 · answered Feb 09 '19 at 12:34

0

Just

for(i in 0 until 5){
    //body
}

answered Feb 09 '19 at 12:34

Andrei Tanana

score 0 · Accepted Answer · answered Feb 09 '19 at 12:34

0

for(i in 0 until 5) {
    // body
}

Where until is an IntRange from 0 to n-1, aka 0..n-1.

Technically if you don't want to use an IntRange, then it's

var i = 0
while(i < 5) {
    // Body
    i++
}

Though I haven't seen that used particularly often.

answered Feb 09 '19 at 12:34

EpicPandaForce

1

There's also standard function [`repeat`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/repeat.html) which can be used instead if starting index is 0. – Pawel Feb 09 '19 at 19:22
Ah yes sorry I forgot even though I've used it before – EpicPandaForce Feb 09 '19 at 19:54

Willi Mentzel · Answer 3 · 2019-02-09T20:09:48.657

-1

In this simple case the shortest way would be to use repeat:

repeat(5) {
    println(it) // 0, 1, 2, 3, 4
}

If you need to specify the start, an IntRange with forEach would be a good idea:

(0 until 5).forEach {
    println(it) // 0, 1, 2, 3, 4
}

If you want to include the end you would create a usual IntRange.

(0..5).forEach {
    println(it) // 0, 1, 2, 3, 4, 5
}

edited Feb 09 '19 at 20:09

answered Feb 09 '19 at 12:36

Willi Mentzel

3 Answers3