Add data to object

let obj = {
    id: 1, 
    name: 'John',
    username: 'Doe'
}

//Using dot notation
obj.items = 10;
console.log(obj);
//Result:
//{id: 1, name: 'John', username: 'Doe', items: 10}

//Using brackets notation
obj['type'] = 'student';
console.log(obj)
//Result: 
//{id: 1, name: 'John', username: 'Doe', items: 10, type: 'student'}