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17 lines
656 B
Plaintext
17 lines
656 B
Plaintext
;; Functions to calculate Fibonacci numbers
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;; Slow recursive version
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(defn slowFib (n) (if (< n 2) n (+ (slowFib (- n 1)) (slowFib (- n 2)))))
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;; Return the sum of the last 2 numbers in a sequence
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(defn sumOfLast (l) (+ (last l) (penult l)))
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;; Faster version, return vector of n numbers, tail call optimized
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(defn fibListRec (n l) (if (< (len l) n) (fibListRec n (push l (sumOfLast l))) l))
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(defn fibList (n) (fibListRec n [0 1]))
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(defn fastFib (n) (sumOfLast (fibList n)))
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;; Add docstrings
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(doc slowFib "Return the nth number from the Fibonacci sequence recursively.")
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(doc fastFib "Return the nth number from the Fibonacci sequence iteratively.")
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