const id = new Set();
id.add(1);
id.add(2);
id.add(3);
id.add(3);// duplicate value will not be added
console.log(id);// output: Set {1, 2, 3}
id.delete(2);// delete the value 2 from the set
console.log(id);// output: Set {1, 3}
id.has(2);// check if the set has the value 2 // output: true
console.log(id);
//order is not guaranteed