如何使用lodash在对象数组中计数

Question

我有如下对象数组：[    {        company: "CompanyName",        id: "1",        userProfile: {            id: "2",                        telephone: "",            user: {                email: "some_email",                firstName: "Firstname",                lastName: "Lastname",                groups: [                    {id: "2", name: "Manager"},                    {id: "10", name: "Remarketing Manager"}                ]            }        }    },    {        company: "CompanyName",        id: "2",        userProfile: {            id: "3",            telephone: "",            user: {                email: "some_email",                firstName: "Firstname",                lastName: "Lastname",                groups: [                    {id: "1", name: "Seller"}                ]            }        }    },    {        company: "CompanyName",        id: "3",        userProfile: {            id: "4",            telephone: "",            user: {                email: "some_email",                firstName: "Firstname",                lastName: "Lastname",                groups: [                    {id: "2", name: "Manager"}                ]            }        }    }]我想依靠group name。因此，我想要的结果是：{   "Manager": 2,   "Seller": 1,   "Remarketing Manager": 1,}我尝试用lodash countBy如下：countBy(users, 'userProfile.user.groups.name');但这是行不通的。https://jsfiddle.net/suf3db4y/1/

Answer 1

您可以使用减少

let data = [{company: "CompanyName",id: "1",userProfile: {id: "2",telephone: "",user: {email: "some_email",firstName: "Firstname",lastName: "Lastname",groups: [{id: "2", name: "Manager"},{id: "10", name: "Remarketing Manager"}]}}},{company: "CompanyName",id: "2",userProfile: {id: "3",telephone: "",user: {email: "some_email",firstName: "Firstname",lastName: "Lastname",groups: [{id: "1", name: "Seller"}]}}},{company: "CompanyName",id: "3",userProfile: {id: "4",telephone: "",user: {email: "some_email",firstName: "Firstname",lastName: "Lastname",groups: [{id: "2", name: "Manager"}]}}}]

let final = data.reduce((op,{userProfile:{user:{groups}}}) => {

  groups.forEach(({name}) => {

    op[name] = op[name] || 0

    op[name]++

  })

  return op

},{})

console.log(final)