From: James Edward Gray II <james@...>
Date: 2006-01-05T10:29:13+09:00
Subject: Re: Default block parameter?

On Jan 4, 2006, at 6:52 PM, Mark J.Reed wrote:

> Okay, this is probably a dumb question, but how do I declare an
> optional block parameter with a default value?
>
> I tried several variations on this basic theme:
>
>         def meth(&block = lambda { |i| ... })
>         ...
>         end
>
> But I keep getting syntax errors.  Help?

Hopefully this will give you some ideas:

 >> def default
 >>   if block_given?
 >>     yield
 >>   else
?>     lambda { puts "Default block" }.call
 >>   end
 >> end
=> nil
 >> default
Default block
=> nil
 >> default { p 2 + 2 }
4
=> nil

James Edward Gray II