public static Student[] firstBeforeLast(Student[] students) { var collection = students .Where(x => x.FirstName.CompareTo(x.LastName)<0) .ToArray(); return collection; }
public static Student[] Order(Student[] students) { var sorted = students .OrderByDescending(x => x.FirstName) .ThenByDescending(x => x.LastName) .ToArray(); return sorted; }
public static string[] AgeRange(Student[] students) { var names = students .Where(x => x.Age >= 18 && x.Age <= 24) .Select(x => x.FirstName+ " "+x.LastName) .ToArray(); return names; }