From: Michel Demazure <michel@...>
Date: 2010-10-11T18:27:39+09:00
Subject: Testing for subarrays

I want to check whether a given array contains a given subarray and
return the corresponding range.
Is there a builtin method ? If not, do you have better than this :

class Array
  def look_up(sub_array)
    len = sub_array.size
    self.each_cons(len).with_index do |cons, index|
      return Range.new(index, index + len - 1) if cons == sub_array
    end
    nil
  end
end

_md
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