在数组中使用嵌套对象进行分组和计数。

Question

[{
    "id":35,
    "aktivis":{
        "id":450,
        "name":"A. Sri Nugroho Hadi",
        "gender": "male",
        "active_job":{
            "id":491,
            "id_aktivis":450,
            "id_company":20,
            "company":{
                "id":20,
                "name":"Company 1"
            }
        }
    }
},
{
    "id":36,
    "aktivis":{
        "id":451,
        "name":"Sri ",
        "gender": "female",
        "active_job":{
            "id":492,
            "id_aktivis":451,
            "id_company":21,
            "company":{
                "id":21,
                "name":"compnay 2"
            }
        }
    }
}]

所以，在我之前的问题之后，有一个答案，在 在一个数组中对数值进行分组和计数

所以它回答了我的问题，但是我又遇到了另一个问题，我没有意识到我确实有。如果我想这样显示我的数组呢？

[{
        "id":20,
        "name":"Company 1"
        "employee_count":1
        "female":0
        "male":1
    },
    {
        "id":22,
        "name":"Company 2"
        "employee_count":1
        "female":1
        "male":0
}]

Answer 1

Object.values([YOUR ARRAY].reduce(function (accumulator, current) {
     const company = current.aktivis.active_job.company;
     accumulator[company.id] = accumulator[company.id] || {
       "id": company.id,
        "name": company.name,
        "employee_count": 0,
        "female": 0,
        "male": 0,
     };

     accumulator[company.id].employee_count += 1;
     if (current.aktivis.gender === 'male') {
       accumulator[company.id].male += 1;
     } else {
       accumulator[company.id].female += 1;
     }

     return accumulator;
   }, {}));

Answer 2

通常我会创建以下的hashmap company id 到数据点，但由于你特别要求一个数组，我们也可以使用 .findIndex 方法来查看是否有公司存在。

const data = [{
    "id":35,
    "aktivis":{
        "id":450,
        "name":"A. Sri Nugroho Hadi",
        "gender": "male",
        "active_job":{
            "id":491,
            "id_aktivis":450,
            "id_company":20,
            "company":{
                "id":20,
                "name":"Company 1"
                }
            }
        }
    },
    {
    "id":36,
    "aktivis":{
        "id":451,
        "name":"Sri ",
        "gender": "female",
        "active_job":{
            "id":492,
            "id_aktivis":451,
            "id_company":21,
            "company":{
                "id":21,
                "name":"compnay 2"
                }
            }
        }
    }
]

let companies = [];

data.forEach(employee => {
    const sex = employee.aktivis.gender;
    const jobData = employee.aktivis.active_job;
    const companyIndex = companies.findIndex(c => c.id === jobData.company.id);
    const companyData = companies[companyIndex]
    if (!companyData) {
        // first time encountering this company need to create a new object
        companies.push({
            id: jobData.company.id,
            name: jobData.company.name,
            employee_count: 1,
            female: sex === "female" ? 1 : 0,
            male: sex === "male" ? 1 : 0,
        })
    } else {
        // company already exists in our array, just need to increment values
        companies[companyIndex][sex]++
        companies[companyIndex].employee_count++
    }
})