フィボナッチ数列
さらに短いのを発見(まだまだ修行が甘い)
fibonacci = 1:1:zipWith (+) fibonacci (tail fibonacci)
zipWithと実験結果
Hugs.Base> zipWith (+) [1,2,3] [4,5,6] [5,7,9] Hugs.Base> take 10 fib where fib=1:1:zipWith (+) fib (tail fib) [1,1,2,3,5,8,13,21,34,55] Hugs.Base> fib !! 10 where fib=1:1:zipWith (+) fib (tail fib) 89
「!!」は rubyの.at()と同じ