Swift - Break Statement

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Swift Break Statement

The break statement in Swift is designed to terminate the control flow statements prematurely. Or we can say that it is used to terminate the loop at a certain condition before reaching its final conclusion. We can use break statements with –

• Loop Statements
• Switch Statements

Syntax

Following is the syntax of the break statement −

break

Flow Diagram

The following flow diagram will show how the break statement works −

Swift break Statement with Loops

The break statement is commonly used with loops. In a loop, when the break condition is true, the loop immediately terminates its iterations and the controls will return to the statement present just after the loop. We can use break statement inside the for-in loop, while loop and in nested loops. If we are using nested loops (i.e., one loop inside another loop), then the break statement will stop the execution of the innermost loop and start executing the next line of the code after the block.

Example

Swift program to demonstrate the use of break statement in a for-in loop.

import Foundation

print("Numbers:")
for x in 1...5 {
   if x == 3 {
    
      // When x is equal to 3 the loop will terminate
      break
   }
   print(x)
}

Output

It will produce the following output −

Numbers:
1
2

Example

Swift program to demonstrate the use of break statement in a nested loop.

import Foundation

// Outer loop 
for x in 1...6 {

   // Inner loop
   for y in 1...5 {
      if y == 4 {
        
         // When y = 4 terminate the inner loops
         break
      }
      print("(\(x), \(y))")
   }
}

Output

It will produce the following output −

(1, 1)
(1, 2)
(1, 3)
(2, 1)
(2, 2)
(2, 3)
(3, 1)
(3, 2)
(3, 3)
(4, 1)
(4, 2)
(4, 3)
(5, 1)
(5, 2)
(5, 3)
(6, 1)
(6, 2)
(6, 3)

Example

Swift program to demonstrate the use of break statement in a while loop.

import Foundation

var x = 2

while true {
   print("Current value of x: \(x)")
    
   if x == 8 {
      print("Loop ends because x is equal to 8.")
      break
   }
   x += 1
}

Output

It will produce the following output −

Current value of x: 2
Current value of x: 3
Current value of x: 4
Current value of x: 5
Current value of x: 6
Current value of x: 7
Current value of x: 8
Loop ends because x is equal to 8.

Swift break Statement with Switch Statement

We can also use a break statement in the switch statement to terminate the switch block after the match of a certain case and control moves to the next statement present after the switch block. All the cases present in the switch must explicitly be terminated using a break statement.

By default, Swift does not fall through to the next case, however, if you want then you can use the fall-through statement.

Example

Swift program to demonstrate the use of a break statement in a switch statement.

import Foundation

let color = "Blue"

switch color {

   case "Blue", "Black", "Brown":
      print("Dark colors")
       
      // Using break statement to break the switch statement
      break  
   case "baby pink", "Blush", "Peach":
      print("Pastel Colors")
   default:
      print("Invalid Color")
}

Output

It will produce the following output −

Dark colors