None.

The same return value as Set.prototype.values(): a new iterable iterator object that yields the values of the set.

Note that you seldom need to call this method directly. The existence of the @@iterator method makes Set objects iterable, and iterating syntaxes like the for...of loop automatically call this method to obtain the iterator to loop over.

const mySet = new Set();
mySet.add("0");
mySet.add(1);
mySet.add({});

for (const v of mySet) {
  console.log(v);
}

You may still manually call the next() method of the returned iterator object to achieve maximum control over the iteration process.

const mySet = new Set();
mySet.add("0");
mySet.add(1);
mySet.add({});

const setIter = mySet[Symbol.iterator]();

console.log(setIter.next().value); // "0"
console.log(setIter.next().value); // 1
console.log(setIter.next().value); // {}

• Set
• Set.prototype.entries()
• Set.prototype.keys()
• Set.prototype.values()
• Symbol.iterator
• Iteration protocols