From: Daniel Brockman <daniel@...>
Date: 2005-08-10T19:48:31+09:00
Subject: Re: passing a method

Hi Wybo,

> I want to make a method which can execute another method
> given to it as an argument.

Why do you want to do this?

> The following works but the call doesn't look elegant -
> is it the ruby way?

It's difficult to tell based on your contrived example,
but the Ruby way would probably be more like this:

   def doit
     yield
   end

   doit { hello }
   doit { bye }
   doit { hello }

You can write `doit { hello }' as `doit &method(:hello)'
if you really want to, but the general block syntax is
obviously much more flexible.

> wybo>cat test.rb
> #!/usr/bin/env ruby
> @t = ''
> def bye
>   @t << 'bye'
> end
> def hello
>   @t << 'hello'
> end
> def doit(f)
>   f.call
> end
> doit(method(:hello))
> doit(method(:bye))
> doit(method(:hello))

This is a rather poor example, since the above three lines
could just as well be written like this:

   hello
   bye
   hello

> puts @t
> wybo>ruby test.rb
> hellobyehello
> wybo>

-- 
Daniel Brockman <daniel@brockman.se>

    So really, we all have to ask ourselves:
    Am I waiting for RMS to do this?   --TTN.