如何在 JavaScript 中根据其中的数据格式化对象数组答案

【问题标题】：How to format Array of Object with respect to the data inside of it in JavaScript如何在 JavaScript 中根据其中的数据格式化对象数组
【发布时间】：2021-10-20 04:28:45
【问题描述】：

我正在尝试创建一个 Object 数组，它将相同的工作日数据添加到一个对象中，例如如果我们在五个对象中有 weekday:1，那么我们将得到

{...{}, weekDay:1, repeated:5}

这是动态数据，我可以使用 hade 代码结果编写代码，例如过滤 weekDay === 1，然后找到返回数组长度，但我现在想要的是一个函数，它获取这个数据数组并返回综合数组不会重复同一个工作日并给我重复的数字，例如

{...{}, weekDay:1, repeated:5}

我们拥有的数据：

[
    {
        "weekDay": 1,
        "role": "admin"
    },
    {
        "weekDay": 2,
        "role": "creator"
    },
    {
        "weekDay": 1,
        "role": "creator"
    },
    {
        "weekDay": 1,
        "role": "creator"
    },
    {
        "weekDay": 1,
        "role": "creator"
    },
    {
        "weekDay": 2,
        "role": "creator"
    },
    {
        "weekDay": 2,
        "role": "screener"
    },
    {
        "weekDay": 2,
        "role": "creator"
    },
    {
        "weekDay": 3,
        "role": "screener"
    },
    {
        "weekDay": 2,
        "role": "creator"
    },
    {
        "weekDay": 2,
        "role": "screener"
    },
    {
        "weekDay": 2,
        "role": "creator"
    },
    {
        "weekDay": 3,
        "role": "creator"
    },
    {
        "weekDay": 3,
        "role": "creator"
    },
    {
        "weekDay": 3,
        "role": "screener"
    },
    {
        "weekDay": 4,
        "role": "creator"
    },
    {
        "weekDay": 3,
        "role": "screener"
    },
    {
        "weekDay": 3,
        "role": "creator"
    },
    {
        "weekDay": 3,
        "role": "screener"
    },
   {
        "weekDay": 4,
        "role": "screener"
    },
    {
        "weekDay": 4,
        "role": "screener"
    },
    {
        "weekDay": 4,
        "role": "screener"
    },
    {
        "weekDay": 5,
        "role": "screener"
    },
    {
        "weekDay": 4,
        "role": "screener"
    },
    {
        "weekDay": 4,
        "role": "creator"
    },
    {
        "weekDay": 4,
        "role": "screener"
    },
    {
        "weekDay": 5,
        "role": "screener"
    },
    {
        "weekDay": 5,
        "role": "screener"
    },
    {
        "weekDay": 5,
        "role": "creator"
    },
    {
       "weekDay": 6,
        "role": "creator"
    },
    {
        "weekDay": 5,
        "role": "screener"
   },
    {
        "weekDay": 1,
        "role": "screener"
    },
    {
        "weekDay": 2,
        "role": "creator"
    },
    {
        "weekDay": 1,
       "role": "screener"
    },
    {
        "weekDay": 1,
        "role": "screener"
    },
    {
        "weekDay": 1,
        "role": "creator"
    },
    {
        "weekDay": 2,
        "role": "screener"
    },
    {
        "weekDay": 2,
        "role": "creator"
    },
    {
        "weekDay": 2,
        "role": "creator"
    },
    {
        "weekDay": 3,
        "role": "creator"
    },
    {
        "weekDay": 2,
        "role": "creator"
    },
    {
        "weekDay": 2,
        "role": "screener"
    },
    {
        "weekDay": 2,
        "role": "screener"
    },
    {
        "weekDay": 3,
        "role": "screener"
    },
    {
        "weekDay": 34,
        "role": "creator"
    }
]

【问题讨论】：

How do I format my posts using Markdown or HTML?
请向我们展示您迄今为止为自己解决此问题所做的尝试，并为输入和预期添加一个最小示例（role 真的与问题相关吗？）给定输入的输出。
首先我希望对整体数据（用户）进行格式化，角色与其中不相关，但之后我也希望在同一工作日创建者和筛选器。比如第一周有多少创作者等等

标签： javascript arrays reactjs sorting formatting

【解决方案1】：

检查这是不是你想要的：

const data = [
    {
        "weekDay": 1,
        "role": "admin"
    },
    {
        "weekDay": 2,
        "role": "creator"
    },
    {
        "weekDay": 1,
        "role": "creator"
    },
    {
        "weekDay": 1,
        "role": "creator"
    },
    {
        "weekDay": 1,
        "role": "creator"
    },
    {
        "weekDay": 2,
        "role": "creator"
    },
    {
        "weekDay": 2,
        "role": "screener"
    },
    {
        "weekDay": 2,
        "role": "creator"
    },
    {
        "weekDay": 3,
        "role": "screener"
    },
    {
        "weekDay": 2,
        "role": "creator"
    },
    {
        "weekDay": 2,
        "role": "screener"
    },
    {
        "weekDay": 2,
        "role": "creator"
    },
    {
        "weekDay": 3,
        "role": "creator"
    },
    {
        "weekDay": 3,
        "role": "creator"
    },
    {
        "weekDay": 3,
        "role": "screener"
    },
    {
        "weekDay": 4,
        "role": "creator"
    },
    {
        "weekDay": 3,
        "role": "screener"
    },
    {
        "weekDay": 3,
        "role": "creator"
    },
    {
        "weekDay": 3,
        "role": "screener"
    },
   {
        "weekDay": 4,
        "role": "screener"
    },
    {
        "weekDay": 4,
        "role": "screener"
    },
    {
        "weekDay": 4,
        "role": "screener"
    },
    {
        "weekDay": 5,
        "role": "screener"
    },
    {
        "weekDay": 4,
        "role": "screener"
    },
    {
        "weekDay": 4,
        "role": "creator"
    },
    {
        "weekDay": 4,
        "role": "screener"
    },
    {
        "weekDay": 5,
        "role": "screener"
    },
    {
        "weekDay": 5,
        "role": "screener"
    },
    {
        "weekDay": 5,
        "role": "creator"
    },
    {
       "weekDay": 6,
        "role": "creator"
    },
    {
        "weekDay": 5,
        "role": "screener"
   },
    {
        "weekDay": 1,
        "role": "screener"
    },
    {
        "weekDay": 2,
        "role": "creator"
    },
    {
        "weekDay": 1,
       "role": "screener"
    },
    {
        "weekDay": 1,
        "role": "screener"
    },
    {
        "weekDay": 1,
        "role": "creator"
    },
    {
        "weekDay": 2,
        "role": "screener"
    },
    {
        "weekDay": 2,
        "role": "creator"
    },
    {
        "weekDay": 2,
        "role": "creator"
    },
    {
        "weekDay": 3,
        "role": "creator"
    },
    {
        "weekDay": 2,
        "role": "creator"
    },
    {
        "weekDay": 2,
        "role": "screener"
    },
    {
        "weekDay": 2,
        "role": "screener"
    },
    {
        "weekDay": 3,
        "role": "screener"
    },
    {
        "weekDay": 34,
        "role": "creator"
    }
];


const map = data.reduce((map, item) => ({ ...map, [item.weekDay]: (map[item.weekDay] || 0) + 1 }), {});
const arr = Object.keys(map).map((key) => ([{ weekDay: key, repeated: map[key] }]));
console.log(arr);

【讨论】：