JavaScript Code

break statement

break statement terminates the execution of the immediate surrounding loop.

break;

or

break [label];

where

• break is keyword.
• label is optional identifier of a loop.

Examples

1. break for loop if i is 5.

for (let i = 0; i < 20; i++) {
    if (i == 5) {
        break;
    }
    console.log('hello world');
}

2. break while loop if i is 5.

let i = 0;
while (i < 20) {
    if (i == 5) {
        break;
    }
    console.log('hello world');
    i++;
}

3. break nested loop

for (let row = 0; row < 4; row++) {
    for (let column = 0; column < 4; column++) {
        if (column > row) {
            break;
        }
        console.log(row + "-" + column);
    }
}

If column > row, inner for loop breaks, because inner for loop is the immediate loop surrounding the break statement.

4. break labeled loop

a: for (let row = 0; row < 4; row++) {
    for (let column = 0; column < 4; column++) {
        if (column > row) {
            break a;
        }
        console.log(row + "-" + column);
    }
}

a is the label given to outer for loop. if column > row, we are breaking the loop labeled with a.