对多维数组进行排序和过滤

arr.sort((a, b) => a[0] - b[0]);

for (let i = 0; i < arr.length - 1; i++) {
  for (let j = 0; j < arr.length - 1 - i; j++) {
    if (arr[j][0] > arr[j + 1][0]) {
      let temp = arr[j];
      arr[j] = arr[j + 1];
      arr[j + 1] = temp;
    }
  }
}

const filteredArr = arr.filter(item => item[0] > 10);

function filterArray(arr, condition) {
  const filteredArr = [];
  for (let i = 0; i < arr.length; i++) {
    if (Array.isArray(arr[i])) {
      const filteredSubArray = filterArray(arr[i], condition);
      if (filteredSubArray.length > 0) {
        filteredArr.push(filteredSubArray);
      }
    } else {
      if (condition(arr[i])) {
        filteredArr.push(arr[i]);
      }
    }
  }
  return filteredArr;
}

const filteredArr = filterArray(arr, item => item[0] > 10);