From: Devin Mullins <twifkak@...>
Date: 2005-08-10T19:55:05+09:00
Subject: Re: passing a method

Wybo Dekker wrote:

> I want to make a method which can execute another method given to it as
> an argument. The following works but the call doesn't look elegant - is
> it the ruby way?

Since all your methods are on the same object, there's a simpler way:

C:\>ruby
@t = ''
def bye
 @t << 'bye'
end
def hello
 @t << 'hello'
end
def doit(f)
 send f   #ri Object#send
end
doit :hello
doit :bye
doit :hello
puts @t
^D
hellobyebello
C:\>

You could also try passing blocks:

C:\>ruby
@t = ''
def bye
 @t << 'bye'
end
def hello
 @t << 'hello'
end
def doit
  yield
end
doit { hello }
doit { bye }
doit { hello }
puts @t
^D
hellobyebello
C:\>

Or modules/classes:

C:\>ruby
module Bye
  def self.greet(t)
    t << 'bye'
  end
end
class Hello
  def self.greet(t)
    t << 'hello'
  end
end
@t = ''
def doit(c)
  c.greet @t
end
doit Hello
doit Bye
doit Hello
puts @t
^D
hellobyehello
C:\>

Longer, but maybe more elegant? Meh, I like the first one best.

Devin