add junior method and roll_call print method

seniors/student.rb

@@ -0,0 +1,80 @@
+class Student
+
+	attr_reader :first_name, :last_name, :grade
+	def initialize(first_name, last_name, grade)
+		@first_name = first_name
+		@last_name = last_name
+		@grade = grade
+	end
+
+	def senior?
+		grade == 12
+	end
+
+  def junior?
+    grade == 11
+  end
+
+	def to_s
+		"#{last_name}, #{first_name}"
+	end
+end
+
+#def seniors(students)
+#  puts "Seniors: "
+#  students.select { |student| student.senior? }.each do |senior|
+#    puts "* #{senior}"
+#  end
+#end
+
+#def juniors(students)
+#  puts "Juniors: "
+#  students.select { |student| student.junior? }.each do |junior|
+#    puts "* #{junior}"
+#  end
+#end
+
+#def roll_call(students, grade)
+#  if ["senior","junior"].include?(grade)
+#    puts "#{grade.capitalize}:"
+#    students.select { |student| student.grade? }.each do |stu| # where grade? is either junior? or senior? based on the method param
+#      puts "* #{stu}"
+#    end
+#  else
+#    puts "Sorry you cannot call that grade"
+#  end  
+#end
+
+def roll_call(students, grade)
+  puts "#{grade.capitalize}:"
+  if grade == "senior"
+    students.select { |student| student.senior? }.each do |stu|
+      puts "* #{stu}"
+    end
+  elsif grade == "junior"
+    students.select { |student| student.junior? }.each do |stu| 
+      puts "* #{stu}"
+    end
+  else
+    puts "Sorry you cannot call that grade"
+  end  
+end
+
+
+fred = Student.new("Fred", "James", 12)
+sarah = Student.new("Sarah", "Smith", 12)
+jack = Student.new("Jack", "Gong", 11)
+all_students = [fred, sarah, jack]
+
+#seniors(all_students).each do |student|
+#  puts "* #{student}\n"
+#end
+#seniors(all_students)
+roll_call(all_students, "senior")
+roll_call(all_students, "junior")
+roll_call(all_students, "freshman")
+
+#juniors(all_students).each do |student|
+#	 puts "* #{student}\n"
+#end
+#juniors(all_students)