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Conway's Game of Life in functional ruby
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def evolve(generation) | |
live_neighbor_stats = generation_stats(generation) | |
live_neighbor_stats[3] + (live_neighbor_stats[2] & generation) | |
end | |
def generation_stats(live_cells) | |
live_cells.each_with_object(Hash.new(0)) {|live_cell, counter| | |
neighbors(*live_cell).each {|neighbor| counter[neighbor] += 1 } | |
}.each_with_object(Hash.new {|h,k| h[k] = []}) {|(cell, count), collector| collector[count] << cell} | |
end | |
def neighbors(x, y) | |
[x-1, x, x+1].product([y-1, y, y+1]) - [[x, y]] | |
end | |
describe "Conway's Game of Life" do | |
it "handles static block object" do | |
block = [[0,1], [1,1], | |
[0,0], [1,0] | |
] | |
evolve(block).should =~ block | |
end | |
it "handles a blinker" do | |
blinker_a = [ [1,2], | |
[1,1], | |
[1,0] | |
] | |
blinker_b = [[0,1], [1,1], [2,1] | |
] | |
evolve(blinker_a).should =~ blinker_b | |
evolve(blinker_b).should =~ blinker_a | |
end | |
it "handles a toad" do | |
toad_a = [ [1,1], [2,1], [3,1], | |
[0,0], [1,0], [2,0] | |
] | |
toad_b = [ [2,2], | |
[0,1], [3,1], | |
[0,0], [3,0], | |
[1,-1] | |
] | |
evolve(toad_a).should =~ toad_b | |
evolve(toad_b).should =~ toad_a | |
end | |
end |
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