I've been wondering if Data::Dumper is getting on towards its freshness date

Data::Dumper has been maintained by P5P alongside the core, so it's unlikely to go stale. It's just a bit unfortunate (IMHO) that its Useqq option is off by default - the other options I use in the linked post are mostly for "nicer" output, so as long as you write use Data::Dumper; $Data::Dumper::Useqq=1;, the module is fine. Data::Dump has prettier output by default, but if you look at its issue list you'll see it's not perfect either. There are lots of other dumper modules out there. The main things to remember are that you want the modules to give unambiguous output (hence Useqq) and that these modules are debugging aids and not data serialization tools.

I think it helps to know that Perl4 had no references˛, so none of the - now normal - nested data-structures described in perldsc were available.

With the introduction of Perl5 multi-dim hashes had to be kept for backwards compatibility, but are for most an unknown or obscure feature.

But they are quite handy sometimes, you'd be surprised how many people tend to reinvent something like $h{ join(",",@dims) }= "x" which is essentially the same without a safer separator.°

HTH! :)

°) a former boss was particularly proud to show me his "genius" trick to safe memory ...

˛) a lot had to be achieved with *type-globs (yuck)

I remember the transition from Perl 3 to Perl 4, yeah. Lots of really useful new features.

One might think that if you had been using Perl for that long you might have run across this feature before?

Just sayin'      :)

You remember Perl 3 ?!? Wait... are you brian d foy? Is this Larry?

---

Give a man a fish:  <%-{-{-{-<

> I remember the transition from Perl 3 to Perl 4, yeah.

I'm afraid your Array::Base is messed up. ;)

Cheers Rolf
_{(addicted to the Perl Programming Language :)
Wikisyntax for the Monastery}

The array emulation is another one of those things I've read about a few times and never really understood well enough to be safe around :-) .

$h{$x, $y, ...}
[download]

$h{join $;, $x, $y, ...}
[download]

That's it.

As long as your keys don't contain the value in $; (which is a control character by default), you can emulate multi-level hashes. It presumably uses less memory, but it might be a bit slower from concatenating the keys??? Of course, you're relying on the value of $; being safe.