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Showing content from https://developer.mozilla.org/es/docs/Web/JavaScript/Reference/Global_Objects/Array/entries below:

Array.prototype.entries() - JavaScript | MDN

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El método entries() retorna un nuevo objeto Array Iterator que contiene los pares clave/valor para cada índice de la matriz.

const array1 = ["a", "b", "c"];

const iterator1 = array1.entries();

console.log(iterator1.next().value);
// Expected output: Array [0, "a"]

console.log(iterator1.next().value);
// Expected output: Array [1, "b"]

Un nuevo objeto iterador Array.

var a = ["a", "b", "c"];
var iterator = a.entries();

for (let e of iterator) {
  console.log(e);
}
// [0, 'a']
// [1, 'b']
// [2, 'c']

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