const setA = new Set([1, 2, 3, 4, 5]);
const setB = new Set([3, 4, 5, 6, 7]);

const union = new Set([...setA, ...setB]);

const intersection = new Set([...setA].filter(x => setB.has(x)));

const differenceAB = new Set([...setA].filter(x => !setB.has(x)));

const symmetricDiff = new Set(
  [...setA, ...setB].filter(x => !(setA.has(x) && setB.has(x)))
);

console.log([...union].join(','));
console.log([...intersection].join(','));
console.log([...differenceAB].join(','));
console.log([...symmetricDiff].join(','));