How do I find .index of a multidimensional array

Question

Tried web resources and didnt have any luck and my visual quick start guide.

If I have my 2d/multidimensional array:

 array = [[\'x\', \'x\',\' x\',\'x\'         


        

Answer 1

array = [['x', 'x',' x','x'],
         ['x', 'S',' ','x'],
         ['x', 'x',' x','x']]
class Array
  def my_index item
    self.each_with_index{|raw, i| return i if raw.include? item}
    return
  end
end

p array.my_index("S") #=>1
p array.my_index("Not Exist Item") #=> nil