如何通过一个键值合并子数组并将符合条件的值推送到更深的索引子数组中？

function mergeAndPushToSubArray(arr) {
  let result = [];

  for (let i = 0; i < arr.length; i++) {
    let subArray = arr[i];
    let key = subArray[0];
    let value = subArray[1];

    if (key === "condition") {
      let deeperIndex = subArray[2];

      if (!result[deeperIndex]) {
        result[deeperIndex] = [];
      }

      result[deeperIndex].push(value);
    }
  }

  return result;
}

// 示例用法
let inputArray = [
  ["key1", "value1"],
  ["key2", "value2"],
  ["condition", "value3", 0],
  ["key3", "value4"],
  ["condition", "value5", 1],
  ["key4", "value6"],
];

let mergedArray = mergeAndPushToSubArray(inputArray);
console.log(mergedArray);

[undefined, ["value3"], ["value5"]]