Initial data commit

Task/Higher-order-functions/AppleScript/higher-order-functions-1.applescript

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+-- This handler takes a script object (singer)
+-- with another handler (call).
+on sing about topic by singer
+    call of singer for "Of " & topic & " I sing"
+end sing
+
+-- Define a handler in a script object,
+-- then pass the script object.
+script cellos
+    on call for what
+        say what using "Cellos"
+    end call
+end script
+sing about "functional programming" by cellos
+
+-- Pass a different handler. This one is a closure
+-- that uses a variable (voice) from its context.
+on hire for voice
+    script
+        on call for what
+            say what using voice
+        end call
+    end script
+end hire
+sing about "closures" by (hire for "Pipe Organ")