From: Sean O'Halpin <sean.ohalpin@...>
Date: 2012-01-20T10:25:32+09:00
Subject: Re: Dynamically Calling a Class Method

On Fri, Jan 20, 2012 at 1:15 AM, Doug Jolley <ddjolley@gmail.com> wrote:
> I need to dynamically call a class method (i.e., unless there is some
> other way, the name of the class method should be contained in a
> variable).  I have come up with the way illustrated in the example shown
> below.  The program is in the file, 'test1'.  The relevant method is in
> the file, 'Test1a.rb'. I use 'eval' which (I believe) is frowned upon.
> Does anyone have a better way of accomplishing this objective?  Thanks
> for any input.
>
>     ... doug
>
> $ ls
> test1  Test1a.rb
> $ cat Test1a.rb
> class Test1a
>  def Test1a.howdy()
>    return 'Hello, world!'
>  end
> end
> $ cat test1
> #!/usr/bin/ruby
>
> require './Test1a.rb'
> myvar='howdy'
> puts(eval("Test1a.#{myvar}()"))
> $ ./test1
> Hello, world!
> $
>
> --

Use #send, e.g.

myvar = "howdy"
Test1a.send(myvar)