63 lines
1.2 KiB
AppleScript
63 lines
1.2 KiB
AppleScript
-- FUNCTIONS TO COMPOSE -------------------------------------------------------
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on root(x)
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x ^ 0.5
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end root
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on succ(x)
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x + 1
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end succ
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on half(x)
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x / 2
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end half
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-- TEST -----------------------------------------------------------------------
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on run
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compose([half, succ, root])'s |λ|(5)
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--> 1.61803398875
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end run
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-- GENERIC FUNCTIONS ----------------------------------------------------------
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-- compose :: [(a -> a)] -> (a -> a)
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on compose(fs)
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script
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on |λ|(x)
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script
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on |λ|(a, f)
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mReturn(f)'s |λ|(a)
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end |λ|
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end script
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foldr(result, x, fs)
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end |λ|
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end script
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end compose
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-- foldr :: (a -> b -> a) -> a -> [b] -> a
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on foldr(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 lng to 1 by -1
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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 foldr
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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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