From: "Jesús Gabriel y Galán" <jgabrielygalan@...>
Date: 2009-12-30T20:51:54+09:00
Subject: Re: How to pass a function as parameter?

On Wed, Dec 30, 2009 at 12:42 PM, Fritz Trapper <ajfrenzel@web.de> wrote:
> I want to pass a reference to function as parameter to another function
> and execute the passed function. Somthing like this:
>
> def executer(func)
>   func(1)
> end
>
> def test(x)
>   p x
> end
>
> executer(test)
>
> How to write this correctly in ruby?

A typical way would be using blocks or procs:

def executer
yield 1
end

executer {|x| puts "I got #{x}"}

If you want something to handle around in a variable:

func = lambda {|x| puts "I got #{x}"}
executer(&func) # => I got 1

Or if in the executer you want to store the block for later use:

def executer(&block)
@save_for_later = block
end

#later...
@save_for_later.call(1) #or @save_for_later[1]

Hope this helps,

Jesus.