None.

The same return value as TypedArray.prototype.values(): a new iterable iterator object that yields the value of each index in the typed array.

Note that you seldom need to call this method directly. The existence of the @@iterator method makes typed arrays iterable, and iterating syntaxes like the for...of loop automatically call this method to obtain the iterator to loop over.

const arr = new Uint8Array([10, 20, 30, 40, 50]);
for (const n of arr) {
  console.log(n);
}

You may still manually call the next() method of the returned iterator object to achieve maximum control over the iteration process.

const arr = new Uint8Array([10, 20, 30, 40, 50]);
const arrIter = arr[Symbol.iterator]();
console.log(arrIter.next().value); // 10
console.log(arrIter.next().value); // 20
console.log(arrIter.next().value); // 30
console.log(arrIter.next().value); // 40
console.log(arrIter.next().value); // 50

• Polyfill of TypedArray.prototype[@@iterator] in core-js
• JavaScript typed arrays guide
• TypedArray
• TypedArray.prototype.entries()
• TypedArray.prototype.keys()
• TypedArray.prototype.values()
• Symbol.iterator
• Iteration protocols