From: "Søren Andersen" <soren.andersen@...>
Date: 2007-10-25T00:31:29+09:00
Subject: Passing methods as parameters - the nice way?

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Hello all,

I'm pretty new to ruby, but have some background in Java, and very little
C(++) and suchlike.
I'm currently - as a "learning-by-doing"-project - creating a simple
text-based interface for running (more or less) arbitrary programs.
I decided on a simple tree-based structure for the menu itself, however I'm
a bit stuck on the hook between my interface, and the program running behin=
d
it.

In order to not couple my interface too tightly to my program running behin=
d
it, I'd really like for my interface to not know what it's actually
interfacing with.
Basically, I just figured I could take a leaf from the
Functional-programming style and give my TextInterface a method to call whe=
n
I told it to:
def call_action
  if(@action_method)
    send(@action_method)
  end
end

which works fine, as long as my method is defined "in the wild":

def foo
  puts "foo called"
end

interface.set_action(:foo)
interface.call_action =3D> foo called

but, how do I handle it if the method is an instance method on some object?
program =3D Program.new
interface.set_action(:program.foo)?
No variant of this works for me.

I realise I may be fundamentally wrong in my approach, so any tips would be
welcome. :-)

Regards,

S=F8ren Andersen

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