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klappy/heads_or_tails.rb

Created December 3, 2012 22:08
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Heads or Tails
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heads_or_tails.rb
samples = 100000.times.with_object([]){|i,a|a.push ["heads","tails"].sample}
#always choose heads
samples.map{|coin|coin=="heads"}.group_by{|o|o}.map.with_object({}){|h,o|o[h[0]]=h[1].count}[true].to_f/1000
#alternate every other call
samples.map.with_index{|coin,i|coin==(i.even? ? "heads" : "tails")}.group_by{|o|o}.map.with_object({}){|h,o|o[h[0]]=h[1].count}[true].to_f/1000
#randomly choose
samples.map{|coin|coin==["heads","tails"].sample}.group_by{|o|o}.map.with_object({}){|h,o|o[h[0]]=h[1].count}[true].to_f/1000
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