first commit

examples/mega_greeter.rb

@@ -0,0 +1,49 @@
+#!/usr/bin/env ruby
+
+class MegaGreeter
+  attr_accessor :names
+
+  def initialize(names = "World")
+    @names = names
+  end
+
+  def say_hi
+    if @names.nil?
+      puts "..."
+    elsif @names.respond_to?("each")
+      @names.each do |name|
+        puts "Hello #{name}!"
+      end
+    else
+      puts "Hello #{@names}!"
+    end
+  end
+
+  def say_bye
+    if @names.nil?
+      puts "..."
+    elsif @names.respond_to?("join")
+      puts "Goodbye #{@names.join(", ")}. Come back soon!"
+    else
+      puts "Goodbye #{@names}. Come back soon!"
+    end
+  end
+end
+
+if __FILE__ == $PROGRAM_NAME
+  greeter = MegaGreeter.new
+  greeter.say_hi
+  greeter.say_bye
+
+  greeter.names = "Zeke"
+  greeter.say_hi
+  greeter.say_bye
+
+  greeter.names = ["Albert", "Brenda", "Charles", "Dave", "Engelbert"]
+  greeter.say_hi
+  greeter.say_bye
+
+  greeter.names = nil
+  greeter.say_hi
+  greeter.say_bye
+end