From: "William (Bill) Froelich" <wfroelich@...>
Date: 2006-03-15T07:42:00+09:00
Subject: Re: Scope of an @variable

I'm also a newbie so others feel free to correct me as well ;-)

Your understanding is correct in that @name applies to the specific
instance of the class and the @@name applies to all instances of the
class.

Hope this example helps.



class Person
	@@lastname = "Doe"
	@name=""
	
	def setLastName(newName)
		@@lastname =  newName
	end
	
	def changeName(newName)
		@name = newName
	end
	
	def sayName()
		"My name is " + @name
	end
	
	def fullName()
		"My full name is " + @name + " " + @@lastname
	end
end

puts "---Defining John---\n"
p1 = Person.new()
p1.changeName('John')
puts p1.sayName()
puts p1.fullName()

puts "\n"

puts "---Defining Jane---\n"
p2 = Person.new()
p2.changeName('Jane')
puts p2.sayName()
puts p2.fullName()

puts "\n"

puts "---Changing Last Name---\n"
p1.setLastName('Smith')

puts "John's full name -> " + p1.fullName()
puts "Jane's full name -> " + p2.fullName()

-----Original Message-----
From: list-bounce@example.com [mailto:list-bounce@example.com] On Behalf
Of Nathan Olberding
Sent: Tuesday, March 14, 2006 4:18 PM
To: ruby-talk ML
Subject: Re: Scope of an @variable

Adam Shelly wrote:
> you need to use @@name.

I was under the impression (newbie alert) that @name was for instances
and @@name was for classes as a whole (ie, @@ variables change that
value in all instances of Class). Is there a way to have variables that
apply to all instances of a Class?

--
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