2016 Update

Task/Flatten-a-list/AppleScript/flatten-a-list-1.applescript

@@ -0,0 +1,11 @@
+my_flatten({{1}, 2, {{3, 4}, 5}, {{{}}}, {{{6}}}, 7, 8, {}})
+
+on my_flatten(aList)
+    if class of aList is not list then
+        return {aList}
+    else if length of aList is 0 then
+        return aList
+    else
+        return my_flatten(first item of aList) & (my_flatten(rest of aList))
+    end if
+end my_flatten

Task/Flatten-a-list/AppleScript/flatten-a-list-2.applescript

@@ -0,0 +1,68 @@
+-- quickSort :: (Ord a) => [a] -> [a]
+on quickSort(xs)
+    set headTail to uncons(xs)
+    if headTail is not missing value then
+        set {h, t} to headTail
+
+        -- lessOrEqual :: a -> Bool
+        script lessOrEqual
+            on lambda(x)
+                x ≤ h
+            end lambda
+        end script
+
+        set {less, more} to partition(lessOrEqual, t)
+
+        quickSort(less) & h & quickSort(more)
+    else
+        xs
+    end if
+end quickSort
+
+
+-- TEST
+on run
+
+    quickSort([11.8, 14.1, 21.3, 8.5, 16.7, 5.7])
+
+    --> {5.7, 8.5, 11.8, 14.1, 16.7, 21.3}
+
+end run
+
+
+
+-- GENERIC FUNCTIONS
+
+-- partition :: predicate -> List -> (Matches, nonMatches)
+-- partition :: (a -> Bool) -> [a] -> ([a], [a])
+on partition(f, xs)
+    tell mReturn(f)
+        set lst to {{}, {}}
+        repeat with x in xs
+            set v to contents of x
+            set end of item ((lambda(v) as integer) + 1) of lst to v
+        end repeat
+        return {item 2 of lst, item 1 of lst}
+    end tell
+end partition
+
+-- uncons :: [a] -> Maybe (a, [a])
+on uncons(xs)
+    if length of xs > 0 then
+        {item 1 of xs, rest of xs}
+    else
+        missing value
+    end if
+end uncons
+
+-- Lift 2nd class handler function into 1st class script wrapper
+-- mReturn :: Handler -> Script
+on mReturn(f)
+    if class of f is script then
+        f
+    else
+        script
+            property lambda : f
+        end script
+    end if
+end mReturn

Task/Flatten-a-list/AppleScript/flatten-a-list-3.applescript

@@ -0,0 +1 @@
+{1, 2, 3, 4, 5, 6, 7, 8}

Task/Flatten-a-list/AppleScript/flatten-a-list.applescript

@@ -1,11 +0,0 @@
-my_flatten({{1}, 2, {{3, 4}, 5}, {{{}}}, {{{6}}}, 7, 8, {}})
-
-on my_flatten(aList)
-	if class of aList is not list then
-		return {aList}
-	else if length of aList is 0 then
-		return aList
-	else
-		return my_flatten(first item of aList) & (my_flatten(rest of aList))
-	end if
-end my_flatten