JavaScript break Statement

The break statement in JavaScript is used to terminate a loop or switch statement prematurely. This means that if a break statement is encountered inside a loop or switch statement, the rest of the code inside the block is not executed, and control is transferred to the first statement after the block.

The syntax for the break statement is as follows:

1break;

The break statement can be used inside for, while, do-while, and switch statements. In the context of a loop, the break statement stops the execution of the current iteration of the loop and moves on to the next statement after the loop.

Here's an example of using the break statement inside a for loop:

1for (let i = 1; i <= 10; i++) {
2  if (i === 5) {
3    break;
4  }
5  console.log(i);
6}
7
8// Output:
9// 1
10// 2
11// 3
12// 4

In this example, the for loop starts at 1 and increments i by 1 until i is greater than 10. The if statement inside the loop checks if i is equal to 5. If the condition is true, the break statement is executed, and the rest of the loop is not executed. The loop terminates and the output is 1, 2, 3, and 4.

The break statement can also be used inside a switch statement to terminate a case. In this case, the break statement stops the execution of the current case and transfers control to the next statement after the switch statement.

Here's an example of using the break statement inside a switch statement:

1let value = 2;
2
3switch (value) {
4  case 1:
5    console.log("block 1");
6    break;
7  case 2:
8    console.log("block 2");
9    break;
10  default:
11    console.log("not match");
12}
13
14// Output:
15// block 2

In this example, the value variable is assigned the value 2, which corresponds to block 2. When the switch statement is executed, it matches the value of value with the cases in the switch statement. When it matches the case 2, the code inside the case is executed, and the break statement is executed to terminate the case. The code inside the default case is not executed.