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13 lines
499 B
Plaintext
13 lines
499 B
Plaintext
;; Functions to calculate Fibonacci numbers
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;; Slow recursive version
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(def slowFib (fn (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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(def sumOfLast (fn (l) (+ (last l) (penult l))))
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;; Faster version, return vector of n numbers, tail call optimized
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(def fibListRec (fn (n l) (if (< (len l) n) (fibListRec n (push l (sumOfLast l))) l)))
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(def fibList (fn (n) (fibListRec n [0 1])))
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(def fastFib (fn (n) (sumOfLast (fibList n))))
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