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

TypedArray.prototype.keys() - JavaScript | MDN

Baseline Widely available

keys() 메서드는 배열의 각 인덱스의 키를 포함하는 새로운 배열 반복자 객체를 반환합니다.

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

새로운 배열 반복자 객체.

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

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

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