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

Array.prototype.keys() - JavaScript | MDN

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O método keys() retorna um novo Array Iterator que contém as chaves para cada index do array.

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

console.log(iterator.next()); // { value: 0, done: false }
console.log(iterator.next()); // { value: 1, done: false }
console.log(iterator.next()); // { value: 2, done: false }
console.log(iterator.next()); // { value: undefined, done: true }

var arr = ["a", , "c"];
var sparseKeys = Object.keys(arr);
var denseKeys = [...arr.keys()];
console.log(sparseKeys); // [0, 2]
console.log(denseKeys); // [0, 1, 2]

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