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Showing content from http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set/Symbol.iterator below:

Set.prototype[Symbol.iterator]() - JavaScript | MDN

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The [Symbol.iterator]() method of Set instances implements the iterable protocol and allows Set objects to be consumed by most syntaxes expecting iterables, such as the spread syntax and for...of loops. It returns a set iterator object that yields the values of the set in insertion order.

The initial value of this property is the same function object as the initial value of the Set.prototype.values property.

const set1 = new Set();

set1.add(42);
set1.add("forty two");

const iterator1 = set1[Symbol.iterator]();

console.log(iterator1.next().value);
// Expected output: 42

console.log(iterator1.next().value);
// Expected output: "forty two"

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 [Symbol.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); // {}

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