[swift] 63. Set symmetricDifference

Set symmetricDifference

• 중복이 되는 요소들을 제외하고 union 된 결과물을 리턴

let friendGroupA = ["철수", "영희", "멍멍", "야옹"]
let friendGroupB = ["철수", "영희", "짹짹", "우엉"]

let friendGroupASet = Set(friendGroupA)
let friendGroupBSet = Set(friendGroupB)

let totalFriend = friendGroupASet.symmetricDifference(friendGroupBSet)
//["멍멍", "야옹", "짹짹", "우엉"]