From: Farrel Lifson <farrel.lifson@...>
Date: 2009-04-30T20:04:18+09:00
Subject: Re: find if an array has any element present in another array

2009/4/30 Charanya Nagarajan <charanya.nagarajan@tcs.com>:
> I have 2 lists
>
> a=[1,2,3,4]
> b=[2,4,6,7,8]
>
> I want to find if there are any elements present in "a" which are also
> present in "b".
> I jus wanna "true" or "false" answer if both of the arrays have any
> element in common.

You can take the intersection of the two and see if it's empty.

if (a & b).empty?
 puts( 'Nothing in common' )
else
  puts( 'Common elements')
end

Farrel
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