Comments on: The Deep Perl Gotcha

By: Todd W

Todd W — Tue, 07 Oct 2008 04:32:08 +0000

perhaps you should have looked at the documentation for each()?

By: Chui

Chui — Tue, 07 Oct 2008 02:49:53 +0000

There are all these people who are yelling RTFM. To these folks, please enlighten us by explaining under which use-case would this particular “feature” would be considered useful and not a bug?

By: Dev Blog AF83 » Blog Archive » Veille technologique : agilité, standards du web, innovation, conseil sur le développement…

Mon, 06 Oct 2008 16:53:37 +0000

[...] http://www.programmish.com/?p=31 : un comportement bizarre de Perl. [...]

By: jt

jt — Sat, 04 Oct 2008 22:01:28 +0000

The Perl documentation is _very_ clear.

You are constructing an argument based on a fallacy – that the operator would work “as exepected” [i.e., as you expect it from you Ruby and Python experience].

And you were wrong. The languages are different languages. Perl is much richer – Perl 6 is way ahead the rest of the pact.

By: Mitch

Mitch — Fri, 03 Oct 2008 21:54:08 +0000

For those confused about the value (usefulness) of the keyword each, consider what is actually happening behind the scenes. “keys” is actually returning an array which the loop then iterates over and is used to reference into the hash. The array being returned requires temporary memory as it is being used. “each” uses an internal iterator and does not require the additional temporary memory.

Yes perl does a decent job handling memory, yadda, yadda, yadda — but sometimes the programmer does in fact know better.

Sadly, resetting the iterator is comparatively expensive since it requires a call to keys or values rather than there being a simple “reset” call.

By: Vineet Kumar

Vineet Kumar — Fri, 03 Oct 2008 20:36:11 +0000

No offense, but if you would choose “set” as the name for a dict, you’re at least a little crazy.

By: Blaxter

Blaxter — Fri, 03 Oct 2008 14:11:23 +0000

I don’t like so much Perl, i’d rather prefer either ruby or python, but i don’t see anything wrong in perl’s behaviour, the code is which is broken in this case. This is the way it should be.

Php works in the same way [0].

You cannot compare the .items() or .each methods in python/ruby against ‘each’ function in perl (or php), they are not the same. You are wrong, not perl.

[0] http://php.net/each

By: patrick

patrick — Fri, 03 Oct 2008 12:29:21 +0000

@Mark

Really? That’s your contribution to a conversation? The Perl community is worse off for your presence.

By: Mark

Mark — Fri, 03 Oct 2008 08:27:11 +0000

Deep Fail. By which I mean you, not Perl.

Next time, RTFM.

By: Taylor

Taylor — Fri, 03 Oct 2008 07:57:54 +0000

perldoc -f each