[Javscript] 합집합, 교집합, 차집합 (feat. Set)

const a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
const b = [1, 3, 5, 7, 9, 11, 13, 15, 17, 19];

// 합집합
const union = (arr1: any[], arr2: any[]) => {
  return new Set([...arr1, ...arr2]);
};

// 교집합
const intersection = (arr1: any[], arr2: any[]) => {
  const set1 = new Set(arr1);
  const set2 = new Set(arr2);
  return new Set([...set1].filter((x) => set2.has(x)));
};

// 차집합
const difference = (arr1: any[], arr2: any[]) => {
  const set1 = new Set(arr1);
  const set2 = new Set(arr2);
  return new Set([...set1].filter((x) => !set2.has(x)));
};