如何将对象的平面数组(可能有多个父对象)转换为对象的嵌套数组

function convertToNestedArray(flatArray) {
  const nestedArray = [];
  const idToObjMap = {};

  // 创建对象的ID到对象的映射
  flatArray.forEach(obj => {
    idToObjMap[obj.id] = obj;
  });

  // 遍历平面数组中的每个对象
  flatArray.forEach(obj => {
    const parentId = obj.parentId;

    // 如果父对象的ID存在，则将当前对象添加到父对象的子对象数组中
    if (parentId) {
      const parentObj = idToObjMap[parentId];
      if (parentObj) {
        if (!parentObj.children) {
          parentObj.children = [];
        }
        parentObj.children.push(obj);
      }
    } else {
      // 如果父对象的ID不存在，则将当前对象作为顶级对象添加到最终的嵌套数组中
      nestedArray.push(obj);
    }
  });

  return nestedArray;
}

// 示例用法
const flatArray = [
  { id: 1, name: 'Object 1', parentId: null },
  { id: 2, name: 'Object 2', parentId: 1 },
  { id: 3, name: 'Object 3', parentId: 1 },
  { id: 4, name: 'Object 4', parentId: 2 },
  { id: 5, name: 'Object 5', parentId: 3 },
];

const nestedArray = convertToNestedArray(flatArray);
console.log(nestedArray);

[
  {
    id: 1,
    name: 'Object 1',
    parentId: null,
    children: [
      {
        id: 2,
        name: 'Object 2',
        parentId: 1,
        children: [
          {
            id: 4,
            name: 'Object 4',
            parentId: 2,
            children: []
          }
        ]
      },
      {
        id: 3,
        name: 'Object 3',
        parentId: 1,
        children: [
          {
            id: 5,
            name: 'Object 5',
            parentId: 3,
            children: []
          }
        ]
      }
    ]
  }
]