2016 Update

Task/Filter/AppleScript/filter-3.applescript

@@ -0,0 +1,30 @@
+-- filter :: (a -> Bool) -> [a] -> [a]
+-- filter :: (a -> Int -> Bool) -> [a] -> [a]
+-- filter :: (a -> Int -> [a] -> Bool) -> [a] -> [a]
+on filter(f, xs)
+    script mf
+        property lambda : f
+    end script
+
+    set lst to {}
+    set lng to length of xs
+    repeat with i from 1 to lng
+        set v to item i of xs
+        if mf's lambda(v, i, xs) then
+            set end of lst to v
+        end if
+    end repeat
+    return lst
+end filter
+
+
+-- Ordinary AppleScript predicate function, rather than a script object
+
+-- isEven :: (a -> Bool)
+on isEven(x)
+    x mod 2 = 0
+end isEven
+
+set lstRange to {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
+
+filter(isEven, lstRange)