fourseven · June 27, 2013 01:44 · Jun 27, 2013
diff --git a/classes.rb b/classes.rb
@@ -0,0 +1,36 @@
+class MailerContact
+  def initialize(first_name, last_name)
+    @first_name, @last_name = first_name, last_name
+  end
+
+  def full_name
+    "#{@first_name} #{@last_name}"
+  end
+end
+
+class Duration
+  def initialize(starting_at, ending_at, unit)
+    @starting_at, @ending_at, @unit = starting_at, ending_at, unit
+  end
+
+  def calculate
+    return 0 unless @ending_at and @starting_at
+    if @unit == 'hour'
+      ((@ending_at - @starting_at) /  1.hour).round(2)
+    else # second
+      @ending_at - @starting_at
+    end
+  end
+end
+
+class Price
+  def initialize(rate, duration)
+    @rate, @duration = rate, duration
+  end
+
+  def calculate
+    @rate * @duration
+  end
+end
+
+
diff --git a/structs.rb b/structs.rb
@@ -0,0 +1,22 @@
+class MailerContact < Struct.new(:first_name, :last_name)
+  def full_name
+    "#{first_name} #{last_name}"
+  end
+end
+
+class Duration < Struct.new(:starting_at, :ending_at, :unit)
+  def calculate
+    return 0 unless ending_at and starting_at
+    if unit == 'hour'
+      ((ending_at - starting_at) /  1.hour).round(2)
+    else # second
+      (ending_at - starting_at).round(0)
+    end
+  end
+end
+
+class Price < Struct.new(:rate, :duration)
+  def calculate
+    rate * duration
+  end
+end