Hey Mike. 
# a perl koan designed for a true perl monk
sub zen
{
   my $coderef = shift; # the code ref is a
   &$coderef; # Find the inner meaning
};
zen (sub {
print "How can I put a variable that is only visable
to zen from within this anon code block?";
});
# mdupont

[download]
Mikey... Thats not an anonymous code block, its a anonymous sub (closure). Theres a difference.
Anon blocks don't return, subs do.
Loop controls dont work in subs, they do in anon blocks.
You can have a reference to a sub but not an anon block.
An anon block can have a LABEL: a sub cannot (hmm, well a named sub IS a label, but a closure cant) 

sub Alpha {
    my $param=shift;
    { # this is an anonymous code block
      return; #this leaves the sub, not just the block
    }
        print "Do you see me?\n";
}

sub Bravo {
    my $n=shift;
    ANONYMOUS:{
        #print "$n\n";
        last ANONYMOUS if !$n;
        $n-- && redo ANONYMOUS
             if $n>10;
        print "$n\n";
        $n-- && redo ANONYMOUS if $n>5;
    }
}

Alpha;
Bravo(20);

[download]

And the style &$coderef is inclined towards errors (and basically deprecated except when taking a reference to a sub), $coderef->() is much easier to understand.

Anyway heres my answer to your koan... 

sub zen {
    my $art=shift;
    my $motorcycle=$art->('of');
    print $$motorcycle.'='.(caller(0))[3];
}

zen sub{return \'maintainance' if $_[0]=='of'};

[download]

HTH
Yves

In reply to Re: The zen of code blocks by Anonymous Monk
in thread The zen of code blocks by mdupont

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