How to get users id after filter and map

Question

I am trying to create an Object with the name and user id for each service, I want the object to look like this:

const object = {
    name: Netflix, user: (user id who pays max price for this provider)
    name: Comcast, user: (same)
    name: Verizon, user: (same)
}

I have tried changing the object property in the map return but it's not working, also I already have the object half done I mean with the names of the providers now I need the other key,value pair

const services = [
     { userid: 1, providerId: 1, amount: 250000 },
     { userid: 4, providerId: 3, amount: 280900 },
     { userid: 6, providerId: 3, amount: 31000 },
     { userid: 2, providerId: 2, amount: 58600 },
     { userid: 3, providerId: 1, amount: 13000 },
     { userid: 5, providerId: 2, amount: 5000 },
     { userid: 3, providerId: 3, amount: 59900 },
     { userid: 6, providerId: 3, amount: 9500 }
]

const providers = [
    { id: 1, name: Netflix },
    { id: 2, name: Comcast },
    { id: 3, name: Verizon }
]

This is my function

function getUserId(providerId) {
    return services.filter(function(obj) {
        if (obj.providerId == providerId)
            return obj.providerId;
    }).map(function(obj) { return obj.amount });
}

function getMaxUserId(providerId) {
    return Math.max(...getUserId(providerId));
}

providers.forEach(prov => {
    object[prov.name] = getUserId(prov.id);
})

as you can see first I filter the entire array looking for the providers with certain providerId then I create a new array with map function filled with all the 'amounts' for that particular provider and last I search for the max amount of that array, this all works fine it return the right max amount for each provider BUT I also want to get the user id who's paying the most for each provider

actually I'm getting my object like this:

[
   {name: Netflix, user: 250000},
   {name: Comcast, user: 58600},
   {name: Verizon, user: 280900}
]

and I need this:

[
   {name: Netflix, user: 1},
   {name: Comcast, user: 2},
   {name: Verizon, user: 4}
]

Answer 1

而且，作为问题的第三种可能的解决方案（跟进我的评论），您可以使用类似的东西（您可以修改对象，但是您认为更符合您的喜好，但我建议完全摆脱name和user键）：

const object = {};

function getUserId(providerId) {
    return services.filter(function(obj) {
        if (obj.providerId == providerId)
            return obj.providerId;
    }).map(function(obj) { return obj });
}

function getMaxUserId(output) {
    let amm = output.map( (o) => { return o.amount; } );
    let idx = amm.indexOf(Math.max(...amm));
    return output[idx].userid;
}

providers.forEach(prov => {
    object[prov.name] = getMaxUserId(getUserId(prov.id));
})

console.log(object)

使用此解决方案的情况下的输出将如下所示：

Object { Netflix: 1, Comcast: 2, Verizon: 4 }

Ofc，通过一个小的调整，您将能够Array按照最初的预期返回一个 with 对象（不要忘记分配object给[]）：

providers.forEach(prov => {
  object.push( {name:prov.name,user:getMaxUserId(getUserId(prov.id))} )
})

在后一种情况下，输出将如下所示：

Array [Object { name: "Netflix", user: 1 }, Object { name: "Comcast", user: 2 }, Object { name: "Verizon", user: 4 }]