break;break label;

labelOptional

Identifier associated with the label of the statement to break to. If thebreak statement is not nested within a loop orswitch, then the label identifier is required.

Whenbreak; is encountered, the program breaks out of the innermostswitch orlooping statement and continues executing the next statement after that.

Whenbreak label; is encountered, the program breaks out of the statement labeled withlabel and continues executing the next statement after that. Thebreak statement needs to be nested within the referenced label. The labeled statement can be any statement (commonly ablock statement); it does not have to be another loop statement.

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

The following function has abreak statement that terminates thewhile loop wheni is 3, and then returns the value3 * x.

function testBreak(x) {  let i = 0;  while (i < 6) {    if (i === 3) {      break;    }    i += 1;  }  return i * x;}

The following code has abreak statement that terminates theswitch statement when a case is matched and the corresponding code has run.

const food = "sushi";switch (food) {  case "sushi":    console.log("Sushi is originally from Japan.");    break;  case "pizza":    console.log("Pizza is originally from Italy.");    break;  default:    console.log("I have never heard of that dish.");    break;}

The following code usesbreak statements with labeled blocks. By usingbreak outerBlock, control is transferred to the end of the block statement marked asouterBlock.

outerBlock: {  innerBlock: {    console.log("1");    break outerBlock; // breaks out of both innerBlock and outerBlock    console.log(":-("); // skipped  }  console.log("2"); // skipped}

Abreak statement must be nested within any label it references. The following code also usesbreak statements with labeled blocks, but generates a syntax error because itsbreak statement referencesblock2 but it's not nested withinblock2.

block1: {  console.log("1");  break block2; // SyntaxError: label not found}block2: {  console.log("2");}

Syntax errors are also generated in the following code examples which usebreak statements within functions that are nested within a loop, or labeled block that thebreak statements are intended to break out of.

function testBreak(x) {  let i = 0;  while (i < 6) {    if (i === 3) {      (() => {        break;      })();    }    i += 1;  }  return i * x;}testBreak(1); // SyntaxError: Illegal break statement

block1: {  console.log("1");  (() => {    break block1; // SyntaxError: Undefined label 'block1'  })();}

• continue
• label
• switch