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Task/Function-composition/Quackery/function-composition.quackery

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+  [ nested swap
+    nested swap join ]  is compose ( g f --> [ )
+
+  ( ----- demonstration ----- )
+
+ ( create a named nest -- equivalent to a function )
+
+  [ 2 * ]               is double  (   n --> n )
+
+  ( "[ 4 + ]" is an unnamed nest
+               -- equivalent to a lambda function. )
+
+  ( "quoting" a nest with ' puts it on the stack
+    rather than it being evaluated. "do" evaluates
+    the top of stack.                              )
+
+  19   ' double   ' [ 4 + ]   compose do echo