September 2017 Update

Task/Closures-Value-capture/AppleScript/closures-value-capture-1.applescript

@@ -5,15 +5,13 @@ on run
         set end of fns to closure(i)
     end repeat
 
-    lambda() of item 3 of fns
-
+    |λ|() of item 3 of fns
 end run
 
-
 on closure(x)
     script
-        on lambda()
-            return x * x
-        end lambda
+        on |λ|()
+            x * x
+        end |λ|
     end script
 end closure

Task/Closures-Value-capture/AppleScript/closures-value-capture-2.applescript

@@ -1,42 +1,54 @@
-on run
+-- CLOSURE --------------------------------------------------------------------
 
-    lambda() of (item 3 of (map(closure, range(1, 10))))
+script closure
+    on |λ|(x)
+        script
+            on |λ|()
+                x * x
+            end |λ|
+        end script
+    end |λ|
+end script
 
-end run
-
-on closure(x)
-    script
-        on lambda()
-            return x * x
-        end lambda
-    end script
-end closure
+|λ|() of (item 3 of (map(closure, enumFromTo(1, 10))))
 
 
+-- GENERIC FUNCTIONS ----------------------------------------------------------
 
--- GENERIC FUNCTIONS
+-- enumFromTo :: Int -> Int -> [Int]
+on enumFromTo(m, n)
+    if n < m then
+        set d to -1
+    else
+        set d to 1
+    end if
+    set lst to {}
+    repeat with i from m to n by d
+        set end of lst to i
+    end repeat
+    return lst
+end enumFromTo
 
 -- map :: (a -> b) -> [a] -> [b]
 on map(f, xs)
-    script mf
-        property lambda : f
-    end script
-    set lng to length of xs
-    set lst to {}
-    repeat with i from 1 to lng
-        set end of lst to mf's lambda(item i of xs, i, xs)
-    end repeat
-    return lst
+    tell mReturn(f)
+        set lng to length of xs
+        set lst to {}
+        repeat with i from 1 to lng
+            set end of lst to |λ|(item i of xs, i, xs)
+        end repeat
+        return lst
+    end tell
 end map
 
-
--- range :: Int -> Int -> Int
-on range(m, n)
-    set lng to (n - m) + 1
-    set base to m - 1
-    set lst to {}
-    repeat with i from 1 to lng
-        set end of lst to i + base
-    end repeat
-    return lst
-end range
+-- 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 |λ| : f
+        end script
+    end if
+end mReturn