From: Daniel Roux <danielroux@...>
Date: 2009-06-16T01:40:39+09:00
Subject: Re: confusion about object method scoping

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On Mon, Jun 15, 2009 at 11:31 AM, Christopher Carver <ccarver0@gmail.com>wrote:

> Hello,
>
> I am defining a class.  That class has several methods.  In one of the
> class methods I'm trying to use a previously defined method.  It's
> throwing an exception.  Here's some code that demonstrates my problem.
>  Am I really unable to have a class use some of it's own methods if
> they've already been defined?  Thanks in advance!
>
> class Calculator
>
>  private
>  def add(x,y)
>   x+y
>  end
>
>  public
>  def Calculator.factorial(x)
>   result = 0
>
>   (1..x).each { |number|
>     result = add(result,number)
>   }
>
>   result
>  end
>
> end


Is it? ArgumentError: wrong number of arguments (0 for 1)
You're calling your method without a required argument.

>
> puts Calculator.factorial()
>
>
Which you defined when you wrote:

  def Calculator.factorial(x)

You could send a default value if you don't want to specify one everytime

 def Calculator.factorial(x = 0)

-- 
Daniel Roux

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