From: Brian Candler <B.Candler@...>
Date: 2003-03-11T08:03:18+09:00
Subject: Re: How to examine method signature ? (via Ruby introspection ?)

On Tue, Mar 11, 2003 at 07:48:29AM +0900, pj wrote:
> TkImage
> 
>   TkImage.public_instance_methods
> 
> Here I find "height". But now I am not clever enough for the next step
> (and I bet there is some simple next step, to see info about this
> method/property)
> 
>   TkImage.instance_method("height")
> 
> #<UnboundMethod: TkImage#height>
> 
> I wonder if someone could give me a suggestion or pointer about how I
> should find out more info about the "height" property or method of the
> class "TkImage" (preferably  using Ruby, if that is reasonably easy).

To find the number of arguments to a method:

  TkImage.instance_method("height").arity

Negative values are returned if the arguments are variable (-1 = 0 or more,
-2 = 1 or more etc).

Regards,

Brian.