Question

I’m learning ruby dev coming from java and I dont understand why im getting below error. @test is a class variable so I should be able to output it ?

C:/Projects/RubyPlayground/Tester.rb:6:in `test': wrong number of arguments (ArgumentError)
    from C:/Projects/RubyPlayground/Tester.rb:6:in `testMethod'
    from C:/Projects/RubyPlayground/Tester.rb:10

source:

class Tester

  @test = "here"

  def testMethod()
    puts test
  end

  s = Tester.new()
  s.testMethod()

end

Answer 1

In this case @test became class instance variable and is associated with class object (not with class instance!). If you want @test behave like a java field, you have to use ‘initialize’ method:

class Tester
  def initialize
    @test = "here"
  end
  def testMethod
    puts @test
  end
end

s = Tester.new()
s.testMethod