Created
August 30, 2013 00:59
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queens
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| def queens_attack?(white_coords, black_coords) | |
| raise ArgumentError.new "Takes only two coordinates" if white_coords.length != 2 || !(white_coords.is_a?(Array)) | |
| raise ArgumentError.new "Takes only two coordinates" if black_coords.length != 2 || !(black_coords.is_a?(Array)) | |
| raise ArgumentError.new "The coordinates must not be the same" if black_coords == white_coords | |
| white_coords.zip(black_coords).flatten.each do |coordinate| | |
| raise TypeError.new "The coordinates must be between 0 and 7" if coordinate < 0 || coordinate > 7 | |
| end | |
| x_diff = (white_coords[0] - black_coords[0]).abs | |
| y_diff = (white_coords[1] - black_coords[1]).abs | |
| can_attack = false | |
| can_attack = true if white_coords[0] == black_coords [0] || white_coords[1] == black_coords[1] | |
| can_attack = true if x_diff == y_diff | |
| return can_attack | |
| end |
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| require 'rspec' | |
| require 'queens' | |
| describe 'queens_attack?' do | |
| it 'raises an exception if not given coordinates' do | |
| expect { queens_attack?("foo", [5, 6]) }.to raise_exception | |
| expect { queens_attack?(5, [5, 6]) }.to raise_exception | |
| expect { queens_attack?([5, 7, 4], [5, 6]) }.to raise_exception | |
| expect { queens_attack?([5, 6], [5, 6]) }.to raise_exception | |
| expect { queens_attack?([5, 7, 4], [5, 6]) }.to raise_exception | |
| expect { queens_attack?([5, 9], [5, 6]) }.to raise_exception | |
| expect { queens_attack?([5, -2], [5, 6]) }.to raise_exception | |
| end | |
| it 'finds two queens in the same row' do | |
| queens_attack?([2, 3], [5, 3]).should be_true | |
| end | |
| it 'finds two queens in the same column' do | |
| queens_attack?([1, 2], [1, 5]).should be_true | |
| end | |
| it 'finds two queens diagonally' do | |
| queens_attack?([1, 3], [3, 5]).should be_true | |
| end | |
| end |
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