Question

I am confused how to call a function defined in a class inside another function defined in that same class. Here is what I have done:

class Test
  def TestFunc(obj)
    puts obj
  end

  def Test.StatFun(obj)
    puts obj
    TestFunc(obj)
  end   
end

Test.StatFun([[5,2], [4,3]])

When I run this in cmd.exe, I get the following error:

ruby LawtonTest.rb 5 2 4 3 LawtonTest.rb:10:in StatFun': undefined
methodTestFunc’ for Test:Class (NoMet hodError)
from LawtonTest.rb:14:in `’

I can’t figure it out. Any help would be greatly appreciated.

Answer 1

You have to call it on the object. I think you need a good reference of oop in Ruby, take a look at http://zetcode.com/lang/rubytutorial/oop/. But anyway, the thing is, methods (which is what you declare with def) have to be called on an object, not like a global function. So if you want to use TestFunc, try this:

def Test.StatFun(obj)
  puts obj
  Test.new.TestFunc(obj)
end

The Test.new part is used to create an object, on which you can use the TestFunc method.