Scala break statement

Scala Loops

Scala does not have a default break statement, but you can use Scala 2.8 version, you can use another method to achieve this break statement. When using break A statement that, when executed, will break out of the loop and execute the code block following the loop body.

Syntax

The syntax for break in Scala is a bit different, as follows:

// Import the following packages
import scala.util.control._
// Create a Breaks object
val loop = new Breaks;
// Looping within breakable
loop.breakable{
    // Loop
    for(...){
       ....
       // Loop Break
       loop.break;
   }
}

Flowchart

Online Example

import scala.util.control._
object Test {
   def main(args: Array[String]) {
      var a = 0;
      val numList = List(1,2,3,4,5,6,7,8,9,10);
      val loop = new Breaks;
      loop.breakable {
         for( a <- numList){
            println( "Value of a: " + a );
            if( a == 4 {
               loop.break;
            }
         }
      }
      println( "After the loop" );
   }
}

The output of the above code is as follows:

$ scalac Test.scala
$ scala Test
Value of a: 1
Value of a: 2
Value of a: 3
Value of a: 4
After the loop

Break Nested Loops

The following example demonstrates how to break nested loops:

import scala.util.control._
object Test {
   def main(args: Array[String]) {
      var a = 0;
      var b = 0;
      val numList1 = List(1,2,3,4,5);
      val numList2 = List(11,12,13);
      val outer = new Breaks;
      val inner = new Breaks;
      outer.breakable {
         for( a <- numList1{
            println( "Value of a: " + a );
            inner.breakable {
               for( b <- numList2{
                  println( "Value of b: " + b );
                  if( b == 12 {
                     inner.break;
                  }
               }
            } // Break of the nested loop
         }
      } // Break of the external loop
   }
}