If local_variable == @variable

honoluludesktop

My SU page fonts are huge today,-), my eyes are not that bad, yet. Anyway I notice that I can not test different kinds of variables, as the following fails:

def anything
  something
  if local_variable == @variable
    something
  else
    something else
  end
end

While the following works:

def anything
  something
  if @local_variable == @variable
    something
  else
    something else
  end
end

Is it a rule in Ruby that you can not test different kinds of variables? Is there other things I need to be aware of because of this?

thomthom

@honoluludesktop said:

My SU page fonts are huge today,-)

SCF you mean? At the top of the page, upper right, you can swap between sizes.

@honoluludesktop said:

Anyway I notice that I can not test different kinds of variables, as the following fails:

Fails with error message, or just doesn't do what you want?

There should be no restrictions, but are you sure you defined all the variables?

honoluludesktop

Yeah, at the office, I get to adjust the view zoom font %, so I found that I had to scale down from 125% to 100%. Don't know why the machine woke up at 125%.

Don't recall error massage, but I didn't separately declare the local variable (vari_1 = 0, vari_2 = 0). OK, I thought that local variables could be created on the fly. Sigh...

thomthom

@honoluludesktop said:

variables could be created on the fly. Sigh...

` x=3

3
puts 'hello' if y == x
Error: #<NameError: undefined local variable or method y' for main:Object> (eval):15

when comparing you need to have initialized the variable.

thomthom

Note that instance variables doesn't act the same:
puts 'hello' if @y == x nil

honoluludesktop

OK, thanks.

fredo6

@honoluludesktop said:

My SU page fonts are huge today,-), my eyes are not that bad, yet. Anyway I notice that I can not test different kinds of variables, as the following fails:

def anything
>   something
>   if local_variable == @variable
>     something
>   else
>     something else
>   end
> end

While the following works:

def anything
>   something
>   if @local_variable == @variable
>     something
>   else
>     something else
>   end
> end

Is it a rule in Ruby that you can not test different kinds of variables? Is there other things I need to be aware of because of this?

you need to initialize the local variables. Otherwise you get an error.

Instance variables (with @) are initialized to nil by default, and this is why you don't get an error.

Fredo

thomthom

And class variables @@.