From: Paul McMahon <pm@...>
Date: 2008-03-01T08:59:21+09:00
Subject: Re: operator |=

On Sat, 01 Mar 2008 08:26:21 +0900, 7stud -- <bbxx789_05ss@yahoo.com>  
wrote:

> From the above you
> should now know how to OR two numbers together: convert the numbers to
> binary format and then OR the columns together.
>

Note that in ruby | is just a method.  For integers it gives the result of  
bitwise or, but other classes define it differently.  For instance, Array  
defines it to return set union, so [1] | [2] is [1,2].