const mySet = new Set();
mySet.add(1);
mySet.add(5);
console.log(mySet);
console.log(mySet.has(1));
console.log(mySet.has(3));
mySet.add(5);
console.log(mySet);
mySet.delete(5);
console.log(mySet);
const mySet2 = new Set();
mySet2.add('João');
mySet2.add('Maria');
mySet2.add('Pedro');
mySet2.add('José');
console.log(mySet2);
console.log(mySet2.size);
console.log(mySet2.has('Maria'));
console.log(mySet2.keys());
console.log(mySet2.entries());