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Contents
module BookKeeping
VERSION = 2
end
class Queens
attr_reader :white, :black
def initialize(positions = {})
@white = positions.fetch(:white) { [0, 3] }
@black = positions.fetch(:black) { [7, 3] }
fail ArgumentError, "Queens cannot be placed on the same spot" if white == black
fail ArgumentError, "Positions must be positive numbers" if (white + black).any? { |p| p < 0 }
fail ArgumentError, "Positions must have square on board" if (white + black).any? { |p| p > 7 }
end
def attack?
on_horizontal? || on_vertical? || on_diagonal?
end
private
def on_horizontal?
white[0] == black[0]
end
def on_vertical?
white[1] == black[1]
end
def on_diagonal?
(black[0] - white[0]).abs == (black[1] - white[1]).abs
end
end
Version data entries
377 entries across 377 versions & 1 rubygems