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Date: Tue, 29 Sep 2015 21:15:01 -0700
From: Ray Andrews <rayandrews@eastlink.ca>
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Subject: Re: wheels within wheels
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On 09/29/2015 08:40 PM, Bart Schaefer wrote:
> }
> } I just learned that it's possible to declare a function within another
> } function.  A strange liberty.
>
> Interpreted language.

Yes.  It's so easy to forget that.
>      function foo {
>        echo defining bar
>        function bar {
> 	echo hello from bar
>        }
>        echo redefining foo
>        function foo {
> 	echo hello from new foo
> 	bar
>        }
>        # this looks like infinite recursion,
>        # but it is not, because foo was redefined
>        foo
>      }
>
>
Now that is mind expanding.  If you tried that in C you'd collapse the 
universe.
Interpreted .... sure, it can saw off the branch it's sitting on because 
there is no
tree.  Each command is past when it's past so that must mean that the 
address of
first foo ... is there ... yes of course there is, the thing is in 
memory ... just aborts
when second foo comes along.  It will expect grammatical completion of 
first foo
for the sake  of etiquette.  And when foo calls itself, it calls new foo 
which is
not recursive.  I am not yet able to snatch the pebble out of your hand, 
but that's
a zsh koan.