Set.prototype[Symbol.iterator]() - JavaScript | MDN
Try it
const set = new Set();
set.add(42);
set.add("forty two");
const iterator = set[Symbol.iterator]();
console.log(iterator.next().value);
// Expected output: 42
console.log(iterator.next().value);
// Expected output: "forty two"
Syntax
Parameters
None.
Return value
The same return value as Set.prototype.values(): a new iterable iterator object that yields the values of the set.
Examples
Iteration using for...of loop
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.
js
const mySet = new Set();
mySet.add("0");
mySet.add(1);
mySet.add({});
for (const v of mySet) {
console.log(v);
}
Manually hand-rolling the iterator
You may still manually call the next() method of the returned iterator object to achieve maximum control over the iteration process.
js
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); // {}
Specifications
| Specification |
|---|
| ECMAScript® 2027 Language Specification # sec-set.prototype-%symbol.iterator% |