Method union

src/07-set/set.ts:110–115

* Returns a new set containing all elements from both sets. * @param otherSet - The set to union with * @returns A new set with all elements * @complexity Time O(n+m) | Space O(n+m)

(otherSet: MySet)

   * @complexity Time O(n+m) | Space O(n+m)
   */
  union(otherSet: MySet): MySet {
    const unionSet = new MySet();
    this.values().forEach(value => unionSet.add(value));
    otherSet.values().forEach(value => unionSet.add(value));
    return unionSet;
  }

  /**
   * Returns a new set containing only elements present in both sets.