Collect unique objects in JavaScript array

Question

Suppose I have following arrays of objects

var firstDataSet = [
  {\'id\': 123, \'name\': \'ABC\'},
  {\'id\': 456, \'name\': \'DEF\'},
  {\'id\': 789, \'nam         


        

Answer 1

This can be achieved By extending Set class Like below

    var firstDataSet = [
      {'id': 123, 'name': 'ABC'},
      {'id': 456, 'name': 'DEF'},
      {'id': 789, 'name': 'GHI'},
      {'id': 101, 'name': 'JKL'}
    ];

    var secondDataSet = [
      {'id': 123, 'name': 'ABC', 'xProp': '1q'},
      {'id': 156, 'name': 'MNO', 'xProp': '2w'},
      {'id': 789, 'name': 'GHI', 'xProp': '3e'},
      {'id': 111, 'name': 'PQR', 'xProp': '4r'}
    ];

    Array.prototype.unshift.apply(firstDataSet , secondDataSet );

    //console.log(firstDataSet)

    class UniqueSet extends Set {
            constructor(values) {
                super(values);

                const data = [];
                for (let value of this) {
                    if (data.includes(JSON.parse(value.id))) {
                        this.delete(value);
                    } else {
                        data.push(value.id);
                    }
                }
            }
          }

console.log(new UniqueSet(firstDataSet))

Working link