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Implement game 2048 in less than 30 lines of Ruby code
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class Game2048 | |
def initialize | |
@array = 4.times.map { [ nil ] * 4 } | |
2.times { fill } | |
end | |
def fill | |
i, j = rand(4), rand(4) | |
return fill if @array[i][j] | |
@array[i][j] = [2, 2, 2, 2, 4].shuffle.first | |
end | |
def move(direction) | |
@array = @array.transpose if %w[up down].include?(direction) | |
@array.each(&:reverse!) if %w[right down].include?(direction) | |
4.times do |i| | |
a = @array[i].compact | |
4.times { |x| a[x], a[x + 1] = a[x] * 2, nil if a[x].to_i == a[x + 1] } | |
@array[i] = a.compact.concat([ nil ] * 4)[0..3] | |
end | |
@array.each(&:reverse!) if %w[right down].include?(direction) | |
@array = @array.transpose if %w[up down].include?(direction) | |
end | |
def play | |
puts @array.map { |line| "[%5s] " * 4 % line } | |
move({ a: 'left', s: 'down', d: 'right', w: 'up' }[gets.strip.to_sym]) | |
fill && play if @array.flatten.include?(nil) | |
end | |
end | |
Game2048.new.play |
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