W3cubDocs

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 [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

entries()

Parameters

None.

Return value

A new iterable iterator object.

Examples

Using 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"]

Specifications

Specification
ECMAScript® 2026 Language Specification> # sec-set.prototype.entries>

Browser compatibility

	Desktop					Mobile							Server
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet	WebView Android	WebView on iOS	Bun	Deno	Node.js
`entries`	38	12	24	25	8	38	24	25	8	3.0	38	8	1.0.0	1.0	0.12.0