From: Adriano Ferreira <a.r.ferreira@...>
Date: 2005-07-30T03:28:19+09:00
Subject: Re: What does this assignment operator |=

On 7/29/05, Stefan Achatz <erazor@mitochondrien.de> wrote:
> i think i once saw an assignment operator |= used in a ruby program.
> I can't find anything in the pickaxe-book and on google.
> What does it do?

Easily, 
    a |= b
is the same as
     a = a | b
and | is bit-or.

It works just like you would expect

    a = 3 #   0...011 in binary
    a |= 4  #  0..0100 in binary
     p a  # prints 7  which 0..000111 in binary