How to filter an array of objects based on multiple unique values?

Question

I have a data set that looks as such:

const data = [{
    "First Name" : "John"
    "Last Name": "Doe"
    "Cars Sold": 2
  },
  {
    "First Name" : "John"
    "Last Name": "Doe"
    "Cars Sold": 1
  },
  {
    "First Name" : "Jane"
    "Last Name": "Doe"
    "Cars Sold": 3
  }];

How would i go about filtering this to get a list of all the people in the object? i.e. the output should be a list of unique people (combination of first and last name) in the object.

Thanks

Thanks for answering Nina. The duplicate question you're referring to doesn't quite solve my issue. Those solutions are only filtering on 1 parameter, while i would like to filter on a combination of two parameters: First Name & Last Name. The dataset contains only two people, but if i filter based on Last Name it would return just 1 name. — Jonas Bæk, Jun 18 '19 at 11:09

Jack Bashford · Accepted Answer · 2019-06-18T21:20:05.530

Unique people, with first and last name separated by a space:

const data = [{"First Name":"John", "Last Name":"Doe", "Cars Sold":2},{"First Name":"John", "Last Name":"Doe", "Cars Sold":1},{"First Name":"Jane", "Last Name":"Doe", "Cars Sold":3}];
const res = [...new Set(data.map(e => e["First Name"] + " " + e["Last Name"]))];
console.log(res);

ES5 syntax:

var data = [{"First Name":"John", "Last Name":"Doe", "Cars Sold":2},{"First Name":"John", "Last Name":"Doe", "Cars Sold":1},{"First Name":"Jane", "Last Name":"Doe", "Cars Sold":3}];
var res = data.map(function(e) {
  return e["First Name"] + " " + e["Last Name"];
}).filter(function(e, i, a) {
  return a.indexOf(e) == i;
});
console.log(res);

score 2 · Answer 2 · edited Jun 18 '19 at 11:08

const data = [{
    "First Name" : "John",
    "Last Name": "Doe",
    "Cars Sold": 2
  },
  {
    "First Name" : "John",
    "Last Name": "Doe",
    "Cars Sold": 1
  },
  {
    "First Name" : "Jane",
    "Last Name": "Doe",
    "Cars Sold": 3
  }];

const list = data.reduce((acc, cur) => acc.includes(`${cur['First Name']} ${cur['Last Name']}`) ? acc : acc.concat([`${cur['First Name']} ${cur['Last Name']}`]), []);

console.log(list);

How to filter an array of objects based on multiple unique values?

2 Answers2