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Showing content from https://developer.mozilla.org/es/docs/Web/JavaScript/Reference/Global_Objects/Set/Symbol.iterator below:

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

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El valor inicial de la propiedad @@iterator, es la misma función objeto que el valor inicial de la propiedad values.

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"

La función iteradora Set , la cuál es values() por defecto.

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); // Object

const mySet = new Set();
mySet.add("0");
mySet.add(1);
mySet.add({});

for (const v of mySet) {
  console.log(v);
}

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