From: Stefan Rusterholz <apeiros@...>
Date: 2007-10-25T01:23:46+09:00
Subject: Re: Passing methods as parameters - the nice way?

S淡ren Andersen wrote:
> Hello all,
> 
> 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 => foo called

I'd suggest using blocks instead of the above construct. Your code 
transformed:

def on_action(&block)
  @action = block
end

def action
  @action.call if @action
end

obj = Object.new
def obj.foo; puts "foo on #{self.inspect} called"; end

interface.on_action { obj.foo }
interface.action

# alternatively:
interface.on_action(&obj.method(:foo))
interface.action

Blocks are far more flexible than passing a method name or instance.

Regards
Stefan
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