1this.item = this.item.filter((el, i, a) => i === a.indexOf(el))

1const addresses = [...]; // Some array I got from async call
2
3const uniqueAddresses = Array.from(new Set(addresses.map(a => a.id)))
4 .map(id => {
5   return addresses.find(a => a.id === id)
6 })

1let person = [
2{name: "john"}, 
3{name: "jane"}, 
4{name: "imelda"}, 
5{name: "john"},
6{name: "jane"}
7];
8
9const data = Array.from(new Set(person.map(JSON.stringify))).map(JSON.parse);
10console.log(data);

1let person = [
2{name: "john"}, 
3{name: "jane"}, 
4{name: "imelda"}, 
5{name: "john"},
6{name: "jane"}
7];
8
9const obj = [...new Map(person.map(item => [JSON.stringify(item), item])).values()];
10console.log(obj);

1arr.reduce((acc, current) => {
2  const x = acc.find(item => item.id === current.id);
3  if (!x) {
4    return acc.concat([current]);
5  } else {
6    return acc;
7  }
8}, []);

1function remove_duplicate_objects(data,prop) {
2    var seen = {};
3    data = data.filter(function (entry) {
4      if (seen.hasOwnProperty(entry[prop])) {
5        return false;
6      }
7
8      seen[entry.prop] = entry;
9      return true;
10    });
11    return data
12  }
13
14const new_array = remove_duplicate_objects([array with objects inside])