Labeled statements

Labeled statements are to be able to specify a context to break or continue in a for loop.

outer: for (let i = 0; i < 5; i++) {
    inner: for (let j = 0; j < 5; j++) {
        if (i === 1 && j === 1) {
            continue outer;
        }

        console.log({ i, j });
    }
}

Could be used, for example, to check items against a number of filters:

const items = [ ... ];
const tests = [ ... ];

itemIteration: for (const item of items) {
    // This label here is unnecessary, but whatever so is this whole technique
    testIteration: for (const test of tests) {
        if (!test(item)) {
            // Skip this item if it fails any of the tests
            continue itemIteration;
        }
    }
}

There is pretty much no reason to ever use this, the latter example might be better written as:

const items = [ ... ];
const tests = [ ... ];

const allTests = (item) => tests.every((test) => test(item));
const passingItems = items.filter(allTests);

See Labeled statement - JavaScript | MDN