Ruby tutorial session 6

Variable/Method Ambiguity Gotcha

In the below mentioned program we are defining a variable called paid, while initializing the class object we are creating instance variable default value is false.

We have make_payment instance method defined here and inside that method we assigning value to the paid variable to true, just notice that in this method we are not overriding/replacing the actual instance variable so after calling the make_payment actual instance variable value won't change, if you try to print the paid value of instance will be false.

1. class Person  
2.   attr_accessor :paid  
3.     
4.   def initialize  
5.     @paid = false  
6.   end  
7.     
8.   def make_payment  
9.     puts "making payment..."  
10.     paid = true  
11.   end  
12. end  
13.   
14. person = Person.new  
15. person.make_payment  
16. puts "paid=#{person.paid}"
17.  
18. Try to execute the above code and practice it by changing the variables.
19.  
20. Hope you will understand, i will get back to you with new concept.