Coding Question

question.rb

def shape(x)
  j = 0 
  arr = Array.new(x.to_i){Array.new(x)}
  while j < x
    i = 0
    while i < x
      first = j
      last  = x - (j+1)
      if (i == first || i == last)
        arr[j][i] = "O" 
      else
        arr[j][i] = "X"
      end
      i = i+1
    end
    j = j + 1
  end
  arr.each {|e| puts e.inspect}
end

shape(5)