Ruby undefined local variable or method

Question

i'm trying to learn ruby, i have this code.

#!/usr/bin/ruby

randomNumber = 5

class Testing
  def self.add
      puts randomNumber * 6
  end
end

Testing.add

And i get the error "Undefined local variable or method 'randomNumber'... But i have defined it .. so i thought, with the randomNumber = 5 .. i've tried int randomNumber = 5 but still no help. I have a feeling my oop sucks and i need to do more reading but i just don't get why this isn't working. Thanks for any help

Why would you think randomNumber is in scope for the Testing class? — Todd A. Jacobs
– Todd A. Jacobs, Commented Oct 14, 2014 at 3:57
@CodeGnome because he's obviously coming from JavaScript. Look at the naming conventions too. — Mulan
– Mulan, Commented Oct 14, 2014 at 4:09

Mulan · Accepted Answer · 2014-10-14 04:06:59Z

2

Ruby doesn't work like javascript

class Testing

  # define a class variable
  @@random_number = 5

  # "add" class method
  def self.add
    puts @@random_number * 6
  end
end

edited Oct 14, 2014 at 4:06

answered Oct 14, 2014 at 3:54

Mulan

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4 Comments

lulalala Over a year ago

My bad, it is $ isn't it :P Never used global variables in Ruby.

Mulan Over a year ago

This isn't a global variable ! It's a class variable !

astreal Over a year ago

why not use a class instance variable (@) over a class variable (@@)? or a constant (screaming_snake_case)?

Max Over a year ago

@astreal Because class variables are entirely appropriate for this case and are easier to use.

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