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

TypedArray.prototype.keys() - JavaScript | MDN

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La méthode keys() renvoie un nouvel objet Array Iterator contenant les clés pour chaque indice du tableau typé.

const uint8 = new Uint8Array([10, 20, 30, 40, 50]);
const keys = uint8.keys();

keys.next();
keys.next();

console.log(keys.next().value);
// Expected output: 2

Un nouvel objet Array Iterator.

var arr = new Uint8Array([10, 20, 30, 40, 50]);
var eArray = arr.keys();
// prérequis : le navigateur doit supporter les
// boucles for..of et les variables dont la portée
// est définie par let
for (let n of eArray) {
  console.log(n);
}

var arr = new Uint8Array([10, 20, 30, 40, 50]);
var eArr = arr.keys();
console.log(eArr.next().value); // 0
console.log(eArr.next().value); // 1
console.log(eArr.next().value); // 2
console.log(eArr.next().value); // 3
console.log(eArr.next().value); // 4

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