如何将嵌套对象数据转换为分组键的数据集？

// 原始数据
let arr = [
    { name: '张三', age: 1 },
    { name: '李四', age: 1 },
    { name: '小红', age: 3 },
    { name: '明明', age: 3 },
    { name: '兰兰', age: 3 },
    { name: '红红', age: 4 },
    { name: '刘明', age: 4 },
    { name: '王五', age: 8 },
    { name: '麻子', age: 8 },
    { name: '瘸子', age: 8 },
];

// 目标数据
targetArr = [
    { 1: '张三', 3: '小红', 4: '红红', 8: '王五' },
    { 1: '李四', 3: '明明', 4: '刘明', 8: '麻子' },
    { 1: '', 3: '兰兰', 4: '', 8: '瘸子' },
];

let arr = [
    { name: '张三', age: 1 },
    { name: '李四', age: 1 },
    { name: '小红', age: 3 },
    { name: '明明', age: 3 },
    { name: '兰兰', age: 3 },
    { name: '红红', age: 4 },
    { name: '刘明', age: 4 },
    { name: '王五', age: 8 },
    { name: '麻子', age: 8 },
    { name: '瘸子', age: 8 },
];

// 初始化目标数据结构
let temp = {};
arr.forEach(item => {
    if (!temp[item.age]) {
        temp[item.age] = [];
    }
    temp[item.age].push(item.name);
});

// 转换数据
let targetArr = [];
Object.values(temp).forEach(value => {
    value.forEach((name, index) => {
        if (!targetArr[index]) {
            targetArr[index] = {};
        }
        Object.keys(temp).forEach(key => {
            if (key in targetArr[index]) {
                return;
            }
            targetArr[index][key] = '';
        });
        targetArr[index][Object.keys(temp).find(key => temp[key] === value)] = name;
    });
});

console.log(targetArr);