SOURCE

let set = new Set();
console.log(set);
// add
set.add(1);
set.add({});
console.log([...set]);
// has
console.log(set.has(1)); // true
// delete
console.log(set.delete(1)); // true
console.log([...set]);
console.log(set);

// clear
set.clear();
console.log(set.size);


let set2 = new Set(['red', 'green', 'blue']);

for (let item of set2.keys()) {
  console.log(item);
}

for (let item of set2.entries()) {
  console.log(item);
}