continue

continue;
continue label;

label Optional

Identifier associated with the label of the statement.

In contrast to the break statement, continue does not terminate the execution of the loop entirely, but instead:

• In a while or do...while loop, it jumps back to the condition.
• In a for loop, it jumps to the update expression.
• In a for...in, for...of, or for await...of loop, it jumps to the next iteration.

The continue statement can include an optional label that allows the program to jump to the next iteration of a labeled loop statement instead of the innermost loop. In this case, the continue statement needs to be nested within this labeled statement.

A continue statement, with or without a following label, cannot be used at the top level of a script, module, function's body, or static initialization block, even when the function or class is further contained within a loop.

The following example shows a while loop that has a continue statement that executes when the value of i is 3. Thus, n takes on the values 1, 3, 7, and 12.

let i = 0;
let n = 0;

while (i < 5) {
  i++;

  if (i === 3) {
    continue;
  }

  n += i;
}

In the following example, a statement labeled checkIAndJ contains a statement labeled checkJ. If continue is encountered, the program continues at the top of the checkJ statement. Each time continue is encountered, checkJ reiterates until its condition returns false. When false is returned, the remainder of the checkIAndJ statement is completed.

If continue had a label of checkIAndJ, the program would continue at the top of the checkIAndJ statement.

let i = 0;
let j = 8;

checkIAndJ: while (i < 4) {
  console.log(`i: ${i}`);
  i += 1;

  checkJ: while (j > 4) {
    console.log(`j: ${j}`);
    j -= 1;

    if (j % 2 === 0) continue checkJ;
    console.log(`${j} is odd.`);
  }
  console.log(`i = ${i}`);
  console.log(`j = ${j}`);
}

Output:

i: 0

// start checkJ
j: 8
7 is odd.
j: 7
j: 6
5 is odd.
j: 5
// end checkJ

i = 1
j = 4

i: 1
i = 2
j = 4

i: 2
i = 3
j = 4

i: 3
i = 4
j = 4

continue cannot be used within loops across function boundaries.

for (let i = 0; i < 10; i++) {
  (() => {
    continue; // SyntaxError: Illegal continue statement: no surrounding iteration statement
  })();
}

When referencing a label, the labeled statement must contain the continue statement.

label: for (let i = 0; i < 10; i++) {
  console.log(i);
}

for (let i = 0; i < 10; i++) {
  continue label; // SyntaxError: Undefined label 'label'
}

The labeled statement must be a loop.

label: {
  for (let i = 0; i < 10; i++) {
    continue label; // SyntaxError: Illegal continue statement: 'label' does not denote an iteration statement
  }
}

• break
• label