From: Rob Biedenharn <Rob@...>
Date: 2011-04-05T05:56:07+09:00
Subject: Re: Using grep on subarrays - help!


On Apr 4, 2011, at 4:05 PM, Simon Harrison wrote:

> Thanks Rob,very useful. Any chance of expanding on this at all:
>
> "a quick, single block
> arg" (as in arry.map{|_|_.something} to mean the same as
> arry.map(&:something) without needing Symbol#to_proc)."
>
> --  
> Posted via http://www.ruby-forum.com/.
>



Here's a little example from an error handler in a script (first  
occurrence in an open buffer):

   rescue => e
     if $stderr.isatty
       $stderr.puts e.message
       $stderr.puts e.backtrace.select {|_| %r{/app/} =~ _}.join("\n\t")
     else
       raise
     end
   end

While I could replace the "_" with a name like "line" or  
"backtrace_line", that doesn't really increase the expressiveness when  
the entire block is one statement/expression.

-Rob

Rob Biedenharn		
Rob@AgileConsultingLLC.com	http://AgileConsultingLLC.com/
rab@GaslightSoftware.com		http://GaslightSoftware.com/