Filter unique values from an array of objects [duplicate]

Question

How can I use Array.filter() to return unique id with name ?

My scenario is slightly different than the solutions I have researched in that I have an array of objects. Every example I find contains a flat array of single values.

data=[
{id: 555, name: "Sales", person: "Jordan" },
{id: 555, name: "Sales", person: "Bob" },
{id: 555, name: "Sales", person: "John" },
{id: 777, name: "Accounts Payable", person: "Rhoda" },
{id: 777, name: "Accounts Payable", person: "Harry" },
{id: 888, name: "IT", person: "Joe" },
{id: 888, name: "IT", person: "Jake" },
];

var unique = data.filter(
function (x, i) {
   return data[i].id.indexOf(x.id) === i
});

Thanks in advance.

Answer 1

I think forEach() is better to achieve what you are looking for:

var data=[
{id: 555, name: "Sales", person: "Jordan" },
{id: 555, name: "Sales", person: "Bob" },
{id: 555, name: "Sales", person: "John" },
{id: 777, name: "Accounts Payable", person: "Rhoda" },
{id: 777, name: "Accounts Payable", person: "Harry" },
{id: 888, name: "IT", person: "Joe" },
{id: 888, name: "IT", person: "Jake" },
];
var resArr = [];
data.forEach(function(item){
  var i = resArr.findIndex(x => x.name == item.name);
  if(i <= -1){
    resArr.push({id: item.id, name: item.name});
  }
});
console.log(resArr);

If you really want to use filter() try the following way:

var data=[
{id: 555, name: "Sales", person: "Jordan" },
{id: 555, name: "Sales", person: "Bob" },
{id: 555, name: "Sales", person: "John" },
{id: 777, name: "Accounts Payable", person: "Rhoda" },
{id: 777, name: "Accounts Payable", person: "Harry" },
{id: 888, name: "IT", person: "Joe" },
{id: 888, name: "IT", person: "Jake" },
];
var resArr = [];
data.filter(function(item){
  var i = resArr.findIndex(x => x.name == item.name);
  if(i <= -1){
    resArr.push({id: item.id, name: item.name});
  }
  return null;
});
console.log(resArr);