Set.prototype.entries()

const set1 = new Set();
set1.add(42);
set1.add("forty two");

const iterator1 = set1.entries();

for (const entry of iterator1) {
  console.log(entry);
  // Expected output: Array [42, 42]
  // Expected output: Array ["forty two", "forty two"]
}

entries()

const mySet = new Set();
mySet.add("foobar");
mySet.add(1);
mySet.add("baz");

const setIter = mySet.entries();

console.log(setIter.next().value); // ["foobar", "foobar"]
console.log(setIter.next().value); // [1, 1]
console.log(setIter.next().value); // ["baz", "baz"]