使用数组平移数组

function shiftLeft(arr, k) {
  for (let i = 0; i < k; i++) {
    const element = arr.shift();
    arr.push(element);
  }
  return arr;
}

const arr = [1, 2, 3, 4, 5];
const k = 2;
const shiftedArr = shiftLeft(arr, k);
console.log(shiftedArr); // 输出：[3, 4, 5, 1, 2]

function shiftRight(arr, k) {
  const n = arr.length;
  k = k % n; // 处理k大于数组长度的情况
  const slicedArr = arr.slice(n - k, n);
  const remainingArr = arr.slice(0, n - k);
  return slicedArr.concat(remainingArr);
}

const arr = [1, 2, 3, 4, 5];
const k = 2;
const shiftedArr = shiftRight(arr, k);
console.log(shiftedArr); // 输出：[4, 5, 1, 2, 3]