
brian d foy
- Website: www.theperlreview.com
- About: I'm the author of Mastering Perl, and the co-author of Learning Perl (6th Edition), Intermediate Perl, Programming Perl (4th Edition) and Effective Perl Programming (2nd Edition).
Recent Actions
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Commented on When Laziness Isn't
Crap, this submitted when I was trying to change something. I had an `alias` example right before the `u 14` line. $ alias u="perl -le 'system q(uuidgen) for 1..$$ARGV[0]'"...
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Commented on When Laziness Isn't
Heh, that's pretty clever to get to some number of values. However, you didn't need the reference: $ perl -le "system q(uuidgen) for 1..5" 76666A86-7155-4EBF-9ED4-F2625DE3CE55 CA1A8D82-467A-4682-8F96-FA0BE0800676 40850CBF-1A41-4803-BE9C-BD87B548826E 08DD5AB6-EBEC-40E9-B4AB-817708A0A584 8BCC70B1-4430-45C6-AF72-5A839EAE6DD5 There can even be a parameter in there: $ u 14...
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Commented on A deep dive into the Perl type systems
Crosslink to /r/perl...
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Commented on Wide character (U+XXXX) in substitution (s///)
Oh heck, I copied the error above the one I wanted. You can see in the (W locale) that this is a locale error: Wide character (U+%X) in %s (W locale) While in a single-byte locale (i.e., a non-UTF-8 one),...
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Commented on Wide character (U+XXXX) in substitution (s///)
If you replace use warnings; with use diagnostics;, you get the longer error messages from perldiag: (S utf8) Perl met a wide character (ordinal >255) when it wasn't expecting one. This warning is by default on for I/O (like print)....
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Commented on London Perl & Raku Workshop 2024: Recordings & Thoughts
Thanks for the videos! I empathize with the complexity of video, and it's why I don't do video. Changing a small mistake takes so much time compared to editing a text file. One of the YouTubers I follow did a...
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Commented on Weather::OWM released on CPAN
+1 for weather APIs!...
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Commented on Let's add Git userdiff defaults for Perl and Perl 6
This is over a decade later, but git now has this in core with many more patterns. See userdiff.c (which you already linked to). You still have to associate the file endings with a the perl driver as you show....
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Commented on Why does this not work
You're trying to get a hash value, but you are using parens instead of braces. You get: he's barney (barney). he's fred (fred). Change your code to use braces for the single element access to the hash: $fn{"fred"} = "flintstone";...
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Commented on Carp::Object, an object-oriented replacement for Carp and Carp::Clan
Very cool! And, someone remembered something I wrote almost 20 years ago. :)...
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Commented on System Thinking
If you want to post anything to /r/perl, know that Reddit has some sort of filter on dev.to. If you message the mods we can approve the link. No idea why this is a thing, but it is in other...
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Commented on I just discovered Dev.to
Note that Reddit filters out dev.to links that people submit, so if you have problems with that in /r/perl, contact the mods....
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Commented on ChatGPT for Perl Learning
Reading might not be how younger generations consume info, but that's not the problem here. It has nothing to do with age or place in time. People have always looked for shortcuts and for ways to avoid learning. New technology...
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Commented on ChatGPT for Perl Learning
I don't think we've had a hard time pumping out docs and examples. The bibliography of Perl books, including The Perl Cookbook, is long. If someone wants to learn Perl, everything they need is in some book....
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Commented on Ordering Your Tests
Test::Manifest uses this feature to take the test order from a separate file (t/test_manifest)...
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Commented on Assert Your Environment
This is brilliant and I must now delay everything I was going to do today to integrate it into everything. Seriously. This would have solved some problems from last week....
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Commented on Outstanding GitHub Items
I had this problem a couple years ago. I was horrified that there were issues in my repos that I'd never seen because I thought I was good at responding to them even if I didn't have a fix. But,...
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Commented on Scalar Context: Lists Versus Arrays
There's also the perlfaq4 answer to "What is the difference between a list and an array?" https://perldoc.perl.org/perlfaq4#What-is-the-difference-between-a-list-and-an-array?...
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Commented on Installing wxPerl for Strawberry Perl v5.32.0, or: Future of wxPerl?
I've had this class of problem on macOS too. Raku's configure script would find a mix of tools from gcc and clang. Ah, I actually found the link: https://stackoverflow.com/questions/34781571/why-does-moarvm-complain-about-built-for-archive-which-is-not-the-architecture/35094347#35094347...
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Commented on Proposal for Perl Foundation Memberships
What vital activities do you think TPF is funding? Conferences mostly raise their own money and TPF is a pass through. TPF is almost completely absent (or present in name only) for most things that keep working. Before you think...
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Commented on Reimagining perl5-porters email list for 2021 and beyond
There are a few other solution issues aside from the functional aspects. If you look at p5p, a small number of people dominate conversations. It's not that they are more active, but they reply more and push their agenda more....
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Commented on Subject Verb Object notation; declarative Perl without the framework
Generally, I try to hide all such technical details. A method can decide to do it's work any way it likes, including calling different packages. However, when you subvert all of that to make resolution specific, you now have to...
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Commented on I failed to pause before blogging
The PAUSE code to discover which packages you use is very simple because it doesn't want to run code. It does a static search for "package IDENTIFIER". Although this won't help in your case, but that's why you sometimes see...
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Commented on Perl dying? Well now I don't care
I have many enhancements to Pod. You don't need to add anything to the basic Pod to get what you want because you can always write your own translator to get it. I think that's a better way to go....
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Commented on Bill & Ted's Bogus Journey
I used to do something similar, but now I pay more attention to whatever CI system I'm using. I'll print a bunch of diagnostic stuff in the setup/install phase....
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Commented on Perl7 is a fork of values
In that video, Bryan Cantrill makes points that don't support the ones you make here. He says that values need to adapt to people and the times, and the people leave when their values aren't represented. His through line is...
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Commented on Perl 7 Thoughts
It's a bit worse than that. Since v5.30 (and v5.26, but not v5.28) mandates the escape of the left brace in a pattern, your v5.32/v7 code has to comply with that. I recently updated my Object::Iterate module to use :prototype....
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Commented on To-Study Plan: a beginning to OO in Perl
Before you jump in Moose and friends, I suggest you try it with straight Perl OO first. You can learn the bare metal approach so when you jump into another framework, you appreciate what it's doing for you. Damian Conway's...
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Commented on PDL: Episode VI - a New Book
I'd love to write a PDL book. It's definitely on my list of interesting ideas. However, good books take quite a bit of time and effort. It's not a matter of simply writing. Most of the pain is in sequencing—what's...
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Commented on Making YAML.pm, YAML::Syck and YAML::XS safer by default
Data::Dumper and Storable have the same problem....

Comment Threads
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raf commented on
London Perl & Raku Workshop 2024: Recordings & Thoughts
It's sad to hear that LPW won't be recorded anymore. Videos are great for those of us who live far away. Thanks for making these videos.
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Klaus Baldermann commented on
London Perl & Raku Workshop 2024: Recordings & Thoughts
There's a reply to this at https://www.perlmonks.org/?node_id=11162837
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Tom Wyant commented on
Wide character (U+XXXX) in substitution (s///)
Nit-pick: Should it be
binmode STDOUT, ':encoding(utf-8)';
? I understood':utf8'
to be simply an assertion that the stream is UTF-8. -
BWVA commented on
A deep dive into the Perl type systems
Thanks, Leon. You've done a great service with this - for Perl practitioners as well as skeptics and newcomers.
I found one sentence I had to read a few times before understanding, under the "Assignment" heading:
"Any scalar can be assigned to. This replaces the value entirely. In reality of course there are various mutating operations for efficiency reasons, but conceptually the model doesn't actually require them creating a new value and assigning it to the old should always be equivalent to the old."
It took me a bit to get that when the second sentence says "shoul…
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Leon Timmermans commented on
A deep dive into the Perl type systems
That's just an editorial mistake on my end, I've updated it to hopefully be more clear.
And very amusing: I still use a module based on blessing the whole glob/symbol table. It's a very powerful tool for me - typically the hash handles transient data like successive records from an iterator, the array is a buffer for capturing things for use later, the IO is for quick output o…

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