Sha256: 6a6c9c461f4d7777cd52aef85234dd99c0bceb24871c8d74c9e3e0303c1cfb44
Contents?: true
Size: 923 Bytes
Versions: 12
Compression:
Stored size: 923 Bytes
Contents
class Queens
attr_reader :white, :black
def initialize(positions = {})
@white = positions.fetch(:white) { [0, 3] }
@black = positions.fetch(:black) { [7, 3] }
fail ArgumentError if white == black
end
def attack?
on_horizontal? || on_vertical? || on_diagonal?
end
def to_s
board = []
(0..7).each do |row|
positions = []
(0..7).each do |column|
positions << draw(row, column)
end
board[row] = positions.join(' ')
end
board.join("\n")
end
private
def on_horizontal?
white[0] == black[0]
end
def on_vertical?
white[1] == black[1]
end
def on_diagonal?
white_diff.abs == black_diff.abs
end
def black_diff
black[1] - black[0]
end
def white_diff
white[1] - white[0]
end
def draw(row, column)
case [row, column]
when white then 'W'
when black then 'B'
else
'_'
end
end
end
Version data entries
12 entries across 12 versions & 1 rubygems