Kotlin: break statement

'break' statement is used to come out of the loop. 'break' statement can be used in two forms.

         a. unlabeled break

         b. labeled break

unlabeled break

Unlabeled break is used to come out from nearest closing loop.

Syntax

break

BreakDemo.kt

fun main(args: Array<String>) {

 for (i in 1..10) {
  println(i)

  if (i == 5) {
   break
  }
 }
}

Output

1
2
3
4
5

BreakDemoInnerLoop.kt

fun main(args: Array<String>) {

 for (i in 1..5) {
  for (j in 1..i) {
   print("$j")
  }
  println()
 }
}

Output

1
12
123
1234
12345

Labelled break

Kotlin allows us to label any expression.

How to create a label?

Define an identifier followed by @ sign.

Ex:

outerLoop@, processState@

By specifying the label, we can come out of the label.

Syntax

break@labelIdentifier

Ex

break@outerLoop

break@processState

LabelledBreakDemo.kt

fun main(args: Array<String>) {

 var counter: Int = 0;

 outerLoop@ for (i in 1..5) {
  for (j in 1..i) {
   counter++
   print("$j")

   if (counter == 6) {
    println("\nBreaking out of the outer loop")
    break@outerLoop
   }
  }
  println()
 }
}

Output

1
12
123
Breaking out of the outer loop

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