65 lines
1.1 KiB
AppleScript
65 lines
1.1 KiB
AppleScript
-- fib :: Int -> Int
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on fib(n)
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-- (Int, Int) -> (Int, Int)
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script lastTwo
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on lambda([a, b])
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[b, a + b]
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end lambda
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end script
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item 1 of foldl(lastTwo, {0, 1}, range(1, n))
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end fib
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-- TEST
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on run
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fib(32)
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--> 2178309
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end run
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-- GENERIC FUNCTIONS
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-- foldl :: (a -> b -> a) -> a -> [b] -> a
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on foldl(f, startValue, xs)
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tell mReturn(f)
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set v to startValue
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set lng to length of xs
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repeat with i from 1 to lng
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set v to lambda(v, item i of xs, i, xs)
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end repeat
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return v
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end tell
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end foldl
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-- Lift 2nd class handler function into 1st class script wrapper
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-- mReturn :: Handler -> Script
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on mReturn(f)
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if class of f is script then
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f
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else
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script
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property lambda : f
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end script
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end if
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end mReturn
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-- range :: Int -> Int -> [Int]
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on range(m, n)
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if n < m then
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set d to -1
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else
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set d to 1
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end if
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set lst to {}
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repeat with i from m to n by d
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set end of lst to i
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end repeat
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return lst
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end range
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