Question

我有一个具有这样响应的API

{conditions:{,…}
individuals:[{employee_id: 12300, employee_type: "Permanent", person_id: "1211211", full_name: "John Jacobs",…},…]
page_num:5
rows:10
total_count:213}

individuals数组中的每个条目都像这样

[ { employee_id: 12300,
    employee_type: 'Permanent',
    person_id: '1211211',
    full_name: 'John Jacobs',
    email_id: 'john_jacobs@gmail.com',
    person_role: [ 
    {rg_code: "AP",
    cl_code: "12",
    data : "South East Asia",
    loc_code : "IN"},

    {rg_code: "CD",
    cl_code: "15",
    data : "Middle East Asia",
    loc_code : "QY"},

    {rg_code: "AP",
    cl_code: "12",
    data : "South East Asia",
    loc_code : "IN"},

    {rg_code: "DF",
    cl_code: "34",
    data : "South East Europe",
    loc_code : "FR"}
     ],
    staffings: [ {id: 1244,
    ind_id: 113322,
    p_id : 112,
    p_name: "Bollywood"},

     {id: 1245,
    ind_id: 112322,
    p_id : 113,
    p_name: "Tollywood"},
    ],
    first_name: 'John',
    last_name: 'Jacobs',
    location:
     { country: 'India',
       region: 'South Asia',
       code: 'SA/IN',
       name: 'Bangalore' },
    assistants: [ {} ],
    job_title: 'SSE-2',
    person_full_name: 'John Jacobs'}
     ]

我试图在individuals数组中查找在loc_code内具有相同person_role的重复条目的所有条目-例如-在下面给出的示例条目中，有两个条目loc_code = 'IN'。是否可以不使用for loops而仅使用filter和reduce方法来解决问题？

Answer 1

您可以应用过滤器，然后缩小以为该人构造一组loc_codes。如果集合的值数量与原始人数相同，则意味着它们都不同。即使遍历整个person_role数组，即使它可能在第一个副本处停止，它的性能也可以得到改善。

var filtered = individuals.filter(el => {
    return el.person_role.reduce( (prev, cur) => { 
        return prev.add(cur.loc_code);
    }, new Set() ).size !== el.person_role.length;
});


console.log(filtered);

Answer 2

您可以将唯一项目的大小与总大小进行比较。我的解决方案包括使用reduce并将其过滤功能提取到一个单独的函数中：

function hasDuplicateLoc({ person_role }) {

    const uniq = person_role.reduce((all, {loc_code}) => {

        if (!all.includes(loc_code)) all.push(loc_code);
        return all;

    }, []);

    return person_role.length !== uniq.length;

}

const result = individuals.filter(hasDuplicateLoc);

console.log(result);

在API返回的JSON对象内的数组中查找具有重复值的条目

2 个答案: