Add some code to School roster

Codecademy.playground/Pages/School roster.xcplaygroundpage/Contents.swift

@@ -5,8 +5,6 @@ var artHistory: Set = ["Samantha", "Vanessa", "Aldrian", "Cynara", "Kenny", "Dec
 var englishLiterature: Set = ["Gabby", "Jasmine", "Alex", "Alif", "Aldrian", "Adam", "Angela"]
 var computerScience: Set = ["Galina", "Kenny", "Sonny", "Alex", "Skyla"]
 
-
-
 var allStudents = spanish101.union(german101)
 allStudents = advancedCalculus.union(artHistory)
 allStudents = artHistory.union(englishLiterature)
@@ -39,3 +37,12 @@ for item in classSet {
 }
 
 print("Classes with 7+ students: \(sevenPlus) classes")
+
+allStudents.remove("Skyla")
+print("All students without Skyla: \(allStudents)")
+
+var fieldTrip = computerScience.union(advancedCalculus)
+print("Combine all students in computer science and advanced calculus")
+
+fieldTrip = fieldTrip.subtracting(german101)
+print("Students in field trip exluding german101: \(fieldTrip)")

Codecademy.playground/Pages/Test_1.xcplaygroundpage/Contents.swift

@@ -0,0 +1,41 @@
+var spanish101: Set = ["Angela", "Declan", "Aldany", "Alex", "Sonny", "Alif", "Skyla"]
+var german101: Set = ["Angela", "Alex", "Declan", "Kenny", "Cynara", "Adam"]
+var advancedCalculus: Set = ["Cynara", "Gabby", "Angela", "Samantha", "Ana", "Aldany", "Galina", "Jasmine"]
+var artHistory: Set = ["Samantha", "Vanessa", "Aldrian", "Cynara", "Kenny", "Declan", "Skyla"]
+var englishLiterature: Set = ["Gabby", "Jasmine", "Alex", "Alif", "Aldrian", "Adam", "Angela"]
+var computerScience: Set = ["Galina", "Kenny", "Sonny", "Alex", "Skyla"]
+
+
+
+var allStudents = spanish101.union(german101)
+allStudents = advancedCalculus.union(artHistory)
+allStudents = artHistory.union(englishLiterature)
+allStudents = computerScience.union(allStudents)
+
+for item in allStudents {
+    print(item)
+}
+
+print("Students quantity: \(allStudents.count)")
+
+var noLanguage = allStudents.subtracting(german101)
+noLanguage = noLanguage.subtracting(spanish101)
+print("Students not taken any language: \(noLanguage)")
+
+var spanishOrGerman = spanish101.symmetricDifference(german101)
+print("Student taken only one language: \(spanishOrGerman)")
+
+var languageAwardWinners = spanish101.intersection(german101)
+languageAwardWinners = languageAwardWinners.intersection(englishLiterature)
+print("Students taken all languages and English literature: \(languageAwardWinners)")
+
+var sevenPlus = 0
+var classSet: Set = [spanish101, german101, advancedCalculus, artHistory, englishLiterature, computerScience]
+
+for item in classSet {
+    if item.count >= 7 {
+        sevenPlus += 1
+    }
+}
+
+print("Classes with 7+ students: \(sevenPlus) classes")