73 lines
1.3 KiB
AppleScript
73 lines
1.3 KiB
AppleScript
------------------------ FACTORIAL -----------------------
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-- factorial :: Int -> Int
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on factorial(x)
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product(enumFromTo(1, x))
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end factorial
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--------------------------- TEST -------------------------
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on run
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factorial(11)
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--> 39916800
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end run
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-------------------- GENERIC FUNCTIONS -------------------
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-- enumFromTo :: Int -> Int -> [Int]
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on enumFromTo(m, n)
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if m ≤ n then
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set xs to {}
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repeat with i from m to n
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set end of xs to i
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end repeat
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xs
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else
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{}
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end if
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end enumFromTo
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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 |λ|(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 |λ| : f
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end script
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end if
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end mReturn
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-- product :: [Num] -> Num
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on product(xs)
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script multiply
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on |λ|(a, b)
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a * b
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end |λ|
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end script
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foldl(multiply, 1, xs)
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end product
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