Kotlin Loops

Loop statements in Kotlin

Loop statements are used to execute a block of statements repeatedly based on a condition or once for each element in a collection.

In this tutorial, we will list out different types of looping statements available in Kotlin, and examples for each of them.

The following tutorials explain looping statements in detail with syntax and a good range of examples.

• Kotlin – For Loop
• Kotlin – While Loop
• Kotlin – Do-while Loop

Kotlin also provides some statements to break or continue the above loops.

• Kotlin – break
• Kotlin – continue

The following tutorials cover some of the special use cases with loop statements.

• Kotlin – For i in range
• Kotlin – Infinite While loop

Examples

In the following, we cover examples for each of the looping statements, break and continue statements.

1. For Loop Example – Iterate over elements of a list

In the following program, for loop is used to print each item of a list.

Main.kt

fun main(args: Array) {
    var daysOfWeek = listOf("Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday")
    for(day in daysOfWeek){
        println(day)
    }
}

Output

Sunday
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday

2. While Loop Example – Print numbers from 1 to N

In this following program, we will use While Loop to print numbers from 1 to n.

Main.kt

fun main() {
    var n = 4

    var i = 1
    while(i <= n){
        println(i)
        i++
    }
}

Output

1
2
3
4

3. Do-while Loop Example – Print numbers from 1 to N

In this following program, we will use Do-while Loop to print numbers from 1 to n.

Main.kt

fun main() {
    var n = 4

    var i = 1
    do {
        println(i)
        i++
    } while(i <= n)
}

Output

1
2
3
4

Conclusion

In this Kotlin Tutorial – Kotlin Loops, we have learned different loop statements available in Kotlin programming, and how to use them to repeat of a specific set or block of statements in a loop.