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

Array.prototype.entries() - JavaScript | MDN

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O método entries() retorna um novo objeto Array Iterator que contém os pares chave/valor para cada índice no array.

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

console.log(eArr.next().value); // [0, 'a']
console.log(eArr.next().value); // [1, 'b']
console.log(eArr.next().value); // [2, 'c']

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

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

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