export function setOperations(
  a: number[],
  b: number[]
): { intersection: number[]; difference: number[] } {
  let intersection = new Set<number>()
  let difference = new Set<number>()

  let newSet = new Set(b)
  for(let i of a){
    newSet.has(i) ? intersection.add(i) : difference.add(i)
  }

  return { intersection: [...intersection], difference: [...difference] };
}