54 lines
1.1 KiB
AppleScript
54 lines
1.1 KiB
AppleScript
------------------------ TRANSPOSE -----------------------
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-- transpose :: [[a]] -> [[a]]
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on transpose(xss)
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script column
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on |λ|(_, iCol)
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script row
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on |λ|(xs)
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item iCol of xs
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end |λ|
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end script
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map(row, xss)
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end |λ|
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end script
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map(column, item 1 of xss)
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end transpose
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--------------------------- TEST -------------------------
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on run
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transpose([[1, 2, 3], [4, 5, 6], [7, 8, 9], [10, 11, 12]])
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--> {{1, 4, 7, 10}, {2, 5, 8, 11}, {3, 6, 9, 12}}
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end run
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-------------------- GENERIC FUNCTIONS -------------------
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-- map :: (a -> b) -> [a] -> [b]
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on map(f, xs)
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tell mReturn(f)
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set lng to length of xs
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set lst to {}
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repeat with i from 1 to lng
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set end of lst to |λ|(item i of xs, i, xs)
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end repeat
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return lst
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end tell
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end map
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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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