Need a little help

ruby-talk
1

Hey Guys,
New to ruby & working on a few tutorials & I'm having trouble with
getting the following code to work & I can't figure out why?

class Animal
  attr_accessor :name
  attr_writer :color
  attr_reader :legs, :arms

  def setup_limbs
    @legs = 4
    @arms = 0
  end

  def noise=(noise)
    @noise = noise
  end

  def color
    "The color is #{@color}."
  end
end

animala = Animal.new
animala.setup_limbs
animala.noise = "Moo!"
animala.name = "Steve"
puts animala.name
animala.color = "black"
puts animala.color
puts animala.legs
puts animala.noise

animalb = Animal.new
animalb.noise = "Quack!"
puts animalb.noise

I've double checked the tutorial (video) & every piece seems to be
correct but where the tutorial works in the video I can't!

Thanks,
Tom

···

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2

Hey Guys,
New to ruby & working on a few tutorials & I'm having trouble with
getting the following code to work & I can't figure out why?

class Animal
attr_accessor :name
attr_writer :color
attr_reader :legs, :arms

def setup_limbs
   @legs = 4
   @arms = 0
end

def noise=(noise)
   @noise = noise
end

This sets @noise, but there's no method for getting the noise back.

You probably need to add either:
  attr_reader :noise
(or just att , :noise following the :legs, :arms in the earlier one)

Or define your own getter like was done for color.

-Rob

···

On Dec 10, 2012, at 6:28 PM, tom mr wrote:

def color
   "The color is #{@color}."
end
end

animala = Animal.new
animala.setup_limbs
animala.noise = "Moo!"
animala.name = "Steve"
puts animala.name
animala.color = "black"
puts animala.color
puts animala.legs
puts animala.noise

animalb = Animal.new
animalb.noise = "Quack!"
puts animalb.noise

I've double checked the tutorial (video) & every piece seems to be
correct but where the tutorial works in the video I can't!

Thanks,
Tom

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

3

Setter:

def some_var_name=(val)
  @some_var_name = val
end

Getter:

def some_var_name
  @some_var_name
end

To set a value, there has to be a setter defined. To retrieve a value,
e.g.

  puts obj.some_var_name

there has to be a getter defined. You canmake ruby define both the
setter and getter for you if you include the following in your class:

  attr_accessor :some_var_name

Or, if you don't want people to be able to set the value, you can define
only the getter:

  attr_reader :some_var_name

(you can also define the getter manually). Etc.

···

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

4

You're also going to want to consider putting an initialize statement in
there for when the object is created.