Break Statement in JavaScript

JavaScript break statement; Through this tutorial, i am going to show you about break statement in javaScript and it’s usage with example.

JavaScript Break Statement

  • JavaScript break statement
  • Syntax of break statement
  • Example 1: break statement with for loop
  • Example 2: Using break statement to exit nested loop

JavaScript break statement

As the name suggests, The javascript break statement breaks/stopped the execution in programs/scripts.

Syntax of JavaScript break statement

 break; 

Example 1: break statement with for loop

See the following example ofbreak statement with for loop:

<script>
    
    var i = 1;
    for (i; i < 10; i++) {
        if (i % 5 == 0) {
            break;
        }
    }
   document.write(i + "<br>")
</script>  

The output of the script shown below:

5

Explanation of above program;

  • To declare a variable  iand initialize it to 1.
  • Then, specified test condition.
  • After that, Increase the value of i by 1 in each iteration of the loop.
  • Use if statement with break.
  • Next, print the value of i.

Example 2: Using break statement to exit nested loop

As mentioned above, you use the break statement to terminate a label statement and transfer control to the next statement following the terminated statement. 

The syntax is as follows:

break label;

The break statement is typically used to exit the nested loop. See the following example.

<script>
    let iterations = 0; 
    top: for (let i = 0; i < 4; i++) { 
            for (let j = 0; j < 4; j++) { 
                iterations++; 
                if (i === 2 && j === 2) { 
                    break top; 
                } 
            } 
        } 
    document.write(iterations + "<br>")
</script>  

The output of the script shown below:

11

Explanation of above program;

  • First, the variable iterations is set to zero.
  • Second, both loops increase the variable i and j from 1 to 4.  In the inner loop, we increase the iteration variable and use an if statement to check both i and j equal 2. If so, the break statement terminates both loops and passes the control over the next statement following the loop.

Conclusion

In this tutorial, you have learned what is break statement and how to use the JavaScript break statement to control the code execution of for loop and nested loop.

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