Chapter1 - Objects, Methods and Variables

Chapter1-Objects and methods/illustration_of_local_variable.rb

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+#A local variable is only visible in a limited part of the program.
+
+
+def say_goodbye
+  x = "Good Bye"
+  puts x
+end
+
+def start_here
+  x = "Hello"
+  puts x
+  say_goodbye
+  puts "Let's check whether x remained the same ?"
+  puts x
+end
+
+start_here

Chapter1-Objects and methods/multiple_arguments.rb

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+#It is possible to write a method that allows any number of arguments.
+#To do this, put a star(an asterish *) in front of a single argument name
+
+
+obj = Object.new
+
+def two_or_more(a,b,*c)
+  puts "Agrs are : "
+  p a, b, c
+end
+
+two_or_more(1,2,3,4,5,6)
+
+#The variable 'x' will be assigned an array of values corresponding to the 
+#arguments that were sent.
+

Chapter1-Objects and methods/respond_to.rb

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+#You can determine in advance whether the object knows how to handle the 
+#message you want to send it, by using the respond_to? method.
+
+obj = Object.new
+if obj.respond_to?("talk")
+  obj.talk
+else
+  puts "Sorry, the object doesn't understand the 'talk' message"
+end
+