set

// set : not allow duplicate value

var strSet = Set<String>()

strSet.insert("100")

strSet.insert("200")

strSet.insert("300")

strSet.insert("100")

strSet.insert("200")

strSet.insert("300")

print(strSet) // result : ["100", "200", "300"]

 

var strArr = ["100", "200", "300", "100", "200", "300",]

print(strArr) // result : ["100", "200", "300", "100", "200", "300"]

print(Set(strArr)) // result : ["200", "100", "300"]

 

var intSet001 : Set = [100, 200, 300]

var intSet002 : Set<Int> = [100, 200, 300]

var intSet003 : Set = [200, 300, 400]

 

// intersection

var intersectionSet = intSet001.intersection(intSet003)

print(intersectionSet) // result : [200, 300]

 

// union

var unionSet = intSet001.union(intSet003)

print(unionSet) // result : [200, 400, 300, 100]

 

// symmetric difference (union set - intersection set)

var symmetricDifferenceSet = intSet001.symmetricDifference(intSet003)

print(symmetricDifferenceSet) // result : [100, 400]

 

// complementary

var complementary001 = intSet001.subtracting(intSet003)

print(complementary001) // result : [100]

var complementary002 = intSet003.subtracting(intSet001)

print(complementary002) // result : [400]