September 2017 Update

Task/Even-or-odd/AppleScript/even-or-odd-1.applescript

@@ -0,0 +1,8 @@
+set nList to {3, 2, 1, 0, -1, -2, -3}
+repeat with n in nList
+    if (n / 2) = n / 2 as integer then
+        log "Value " & n & " is even."
+    else
+        log "Value " & n & " is odd."
+    end if
+end repeat

Task/Even-or-odd/AppleScript/even-or-odd-2.applescript

@@ -0,0 +1,45 @@
+-- even :: Integral a => a -> Bool
+on even(n)
+    n mod 2 = 0
+end even
+
+-- odd :: Integral a => a -> Bool
+on odd(n)
+    not even(n)
+end odd
+
+
+-- GENERIC FUNCTIONS FOR TEST ----------------------------------
+
+-- filter :: (a -> Bool) -> [a] -> [a]
+on filter(f, xs)
+    tell mReturn(f)
+        set lst to {}
+        set lng to length of xs
+        repeat with i from 1 to lng
+            set v to item i of xs
+            if lambda(v, i, xs) then set end of lst to v
+        end repeat
+        return lst
+    end tell
+end filter
+
+-- 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
+
+
+-- TEST ---------------------------------------------------------
+on run
+    set xs to [-6, -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6]
+
+    {filter(even, xs), filter(odd, xs)}
+end run

Task/Even-or-odd/AppleScript/even-or-odd-3.applescript

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

Task/Even-or-odd/AppleScript/even-or-odd.applescript

@@ -1,8 +0,0 @@
-set nList to {3, 2, 1, 0, -1, -2, -3}
-repeat with n in nList
-	if (n / 2) = n / 2 as integer then
-		log "Value " & n & " is even."
-	else
-		log "Value " & n & " is odd."
-	end if
-end repeat