From: Doug Jolley <ddjolley@...>
Date: 2012-01-20T10:15:16+09:00
Subject: Dynamically Calling a Class Method

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!
$

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