Class Inheritance example in Ruby

Following is an example of class inheritance in ruby programming. Do make notice of use of super and "<" for inheritance.

 

class HelloParent

    attr_accessor :name

    def initialize( name )
        print "\nThis is a parent program, Hello #{name}"
        @name = name
    end

    def sayHello
        print "\nI am asked to say Hello #{@name}"
    end
       
end

class HelloChild < HelloParent
    def initialize( name, surname )
        print "\nI am a child class #{surname}"
        super(name)
    end
end

child = HelloChild.new( "Ak", "Kumar" )
child.sayHello

 

In avove try putting something like following:

 

child = HelloChild( "Ak", "Kumar" )

child = new HelloChild( "Ak", "Kumar" )

 

 

And you get the following error:

 

hw2.rb:21: undefined method `HelloChild' for main:Object (NoMethodError)