From: Pete Elmore <pete@...>
Date: 2005-08-02T05:18:47+09:00
Subject: Re: array in array, like include?

Ben wrote:
> a = [1,2,3,4,5]
> b = [1,4]
> 
> a.include?(b) will only work if b is a string. I'd like to get a
> true/false if b exists in a.
The to_set solution is probably better, but you could do something like
class Array
	def subset(s)
		!s.find { |el| !self.include? el }
	end
end

irb(main):018:0> [1, 2, 3, 4].subset([1, 2])
=> true
irb(main):019:0> [1, 2, 3, 4].subset([1, :seventy_five])
=> false