Queen Attack

queen_attack.rb

class Queens
  attr_reader :white, :black
  
  def initialize(queens = { white: [0, 3], black: [7, 3] })
    fail ArgumentError if queens[:white] == queens[:black]
    @white = queens[:white]
    @black = queens[:black]
  end
  
  def to_s
    board = 8.times.map { '________' }
    board[white[0]][white[1]] = 'W'
    board[black[0]][black[1]] = 'B'
    board.map! { |row| row.split("").join(" ") }
    board.join("\n")
  end
  
  def attack?
    delta_y = black[0] - white[0]
    delta_x = black[1] - white[1]
    delta_y == delta_x || delta_y == (-1) * delta_x || delta_y == 0 || delta_x == 0
  end
end