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Showing content from https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set/entries below:

Set.prototype.entries() - JavaScript | MDN

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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.

const set1 = new Set();
set1.add(42);
set1.add("forty two");

const iterator1 = set1.entries();

for (const entry of iterator1) {
  console.log(entry);
  // Expected output: Array [42, 42]
  // Expected output: Array ["forty two", "forty two"]
}

None.

A new iterable iterator object.

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"]

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