From: Gennady Bystritsky <Gennady.Bystritsky@...>
Date: 2009-08-04T14:23:42+09:00
Subject: Re: The Easiest way to check if one array is a subset of another

> -----Original Message-----
> From: superdisconnect@hotmail.com [mailto:superdisconnect@hotmail.com]
> Sent: Monday, August 03, 2009 10:13 PM
> To: ruby-talk ML
> Subject: The Easiest way to check if one array is a subset of another
> 
> I want to find the easiest way if one array is a subset of another
> 
> for example
> 
>  A                    b
> [1,2,4,5,6,7,9]      [1,3,9] =>true
> 
>  A                    b
> [1,2,4,5,6,7,9]      [1,3,8] =>false
> --
> Posted via http://www.ruby-forum.com/.


If I understand correctly what you really want, the first example should produce false, as array "a" does not have 3. Assuming that you meant [1,2,3,4,5,6,7,9] I think the following will work for you:

(a & b) == b

Gennady.