From: Joel VanderWerf <vjoel@...>
Date: 2003-03-12T10:00:10+09:00
Subject: Re: a newbie question

Gennady wrote:
> That's what I've been missing in Ruby!!! Thank you very much, Daniel (and
> Matz, of course). I just verified that Enumerable#grep simply invokes method
> "===" on its parameter for every element, and that's exactly what I usually
> need. And with an optional block you get "selective collect" functionality.
> This is so great!!!

=== is one of the unsung heroes of ruby. It's a protocol that unifies 
grep and case into a general notion of pattern matching. Here's one use 
I like:

irb> [1,2,"345","678"].grep String
["345", "678"]