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

Array.prototype.entries() - JavaScript | MDN

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La méthode entries() renvoie un nouvel objet de type Array Iterator qui contient le couple clef/valeur pour chaque éléments du tableau.

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 nouvel objet qui est un itérateur pour Array.

const arr = ["a", "b", "c"];
for (const [index, element] of arr.entries()) {
  console.log(index, element);
}
// 0 "a"
// 1 "b"
// 2 "c"

On peut avoir le même résultat en utilisant une boucle for...of :

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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