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Subject: Re: Understanding global variables.
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Fily Salas wrote in post #992993:
>
> This may be confusing because I have never heard about =E2=80=9CSELF=E2=
=80=9D statement,
> =E2=80=9CINITIALZE=E2=80=9D method and the =E2=80=9C:=E2=80=9D notation=
, I guess I need to read more
> about the language.
>

Knowing which object is 'self' is sort of an intermediate topic, but it =

is critical to understanding how ruby works.

> What would happen if I position a variable using the wrong syntax? In
> other words if I position a variable where an instance variable would
> normally go but without the @ will Ruby get confused and treat this
> differently and may get an error or the interpreter will simply use it
> and keep track of what kind of variable it is by itself.
>

A variable name that is not preceded by an '@', is called a 'local =

variable', and a local variable ceases to exist once the method ends. =

Here is an example:

class Dog
  def initialize(a_name, a_color)
    @name =3D a_name
    color =3D a_color
  end

  def name
    @name   #same as 'return @name'
  end

  def name=3D(str)
    @name =3D str
  end

  def color
    @color  #same as 'return @color'
  end


end

my_dog =3D Dog.new('Spot', 'black')
#Calling new() automatically causes initialize()
#to execute.

puts my_dog.name   #=3D> Spot
my_dog.name =3D 'Max'
puts my_dog.name   #=3D> Max

puts my_dog.color  #=3D> <nothing>


> Any good tutorial about variables in Ruby?

"Beginning Ruby (2nd ed)" by Cooper

-- =

Posted via http://www.ruby-forum.com/.=