Set.prototype.entries()
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
The entries() method of Set instances returns a new set iterator object that contains an array of [value, value] for each element in this set, in insertion order. For Set objects there is no key like in Map objects. However, to keep the API similar to the Map object, each entry has the same value for its key and value here, so that an array [value, value] is returned.
Try it
const set = new Set();
set.add(42);
set.add("forty two");
const iterator = set.entries();
for (const entry of iterator) {
console.log(entry);
// Expected output: Array [42, 42]
// Expected output: Array ["forty two", "forty two"]
}
Syntax
js
entries()
Parameters
None.
Return value
A new iterable iterator object.
Examples
Using entries()
js
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"]
Specifications
| Specification |
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| ECMAScript® 2027 Language Specification # sec-set.prototype.entries |
Browser compatibility
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