From: James Edward Gray II <james@...>
Date: 2005-11-23T08:14:14+09:00
Subject: Re: How convert an integer to a bit array

On Nov 22, 2005, at 4:23 PM, Curt Hibbs wrote:

> Does anyone have a clever way to convert an integer to an array of bit
> values?
>
> For example (using 8 bit integers):
>
> 0 => [0, 0, 0, 0, 0, 0, 0, 0]
> 1 => [0, 0, 0, 0, 0, 0, 0, 1]
> 2 => [0, 0, 0, 0, 0, 0, 1, 0]
> 7 => [0, 0, 0, 0, 0, 1, 1, 1]
> etc.
>
> I was looking at Array#pack and Array#unpack to do this, but  
> haven't figured
> it out yet. It just seems like there ought to be a simple way to do  
> this.
>
> Anybody got a clever idea?

Another thought:  Ruby's Integers are already pretty close to a bit  
Array.  If you only need to index the bits, maybe it's best not to  
convert at all...

James Edward Gray II