From: GianFranco Bozzetti <gf.bozzetti@...>
Date: 2010-04-12T15:55:14+09:00
Subject: Re: Comparing Arrays


"Derek Cannon" <novellterminator@gmail.com> wrote in message 
news:24f32d608e99f3ef93bca701fdfe130c@ruby-forum.com...
> Hello everyone, another easy question from a beginner: How do you create
> a method to compare two arrays so that if they share at least 1 common
> element it returns true?
>
> For example:
> a = %w(m w f)
> b = %w(m w)
> c = %w(t r)
>
> share_elements?(a,b) #=> true
> share_elements?(a,c) #=> false
>
> Thanks for your time,
> Derek
> -- 
> Posted via http://www.ruby-forum.com/.
>
An answer:

# array_cmp.rb
def share_elements?(a1,a2)
   not (a1 & a2).empty?
end

a = %w(m w f)
b = %w(m w)
c = %w(t r)

r = share_elements?(a,b) #=> true
printf("%12s/%-12s => %s\n", a.inspect.to_s, b.inspect.to_s, r.to_s)
r = share_elements?(a,c) #=> false
printf("%12s/%-12s => %s\n", a.inspect.to_s, c.inspect.to_s, r.to_s)
exit(0)

Hth gfb