perl -MHTTP::Tiny -le'$|++;for(split/\n/,HTTP::Tiny->new->get("https:/
+/fastapi.metacpan.org/source/LWALL/perl5.002b3/pod/perldiag.pod")->{c
+ontent}){print${1}and$-++if/^=item\s+(\S\S.*)$/}print(($-+1)," diagno
+stic warnings, deprecations, errors in perl 5.002b3 Feb 03, 1996")'
[download]

perl -MConfig=compile_date -le'$|++;for(`perldoc -u perldiag`){print${
+1}and$-++if/^=item\s+(\S\S.*)$/}print(($-+1)," diagnostic warnings, d
+eprecations, errors in perl $^V ").compile_date()'
[download]

perl -MConfig=compile_date -le'$|++;for(`perldoc -u perldiag`){print${
+1}and$-++if/^=item\s+(\S\S.*)$/}print(($-+1)," diagnostic warnings, d
+eprecations, errors in perl $^V ").compile_date()' | grep 'forbidden'
[download]

Experimental %s on scalar is now forbidden
Initialization of state variables in list currently forbidden
Setting $/ to a reference to %s is forbidden
Setting $/ to %s reference is forbidden
Use of bare << to mean <<"" is forbidden
Use of strings with code points over 0xFF as arguments to vec is forbidden

Question:
write an app that would render a Mandelbrot set in perl

Answer: I'll help you write a Perl script to render the Mandelbrot set. I'll provide a comprehensive example that creates a visual representation of the Mandelbrot set using a simple ASCII or color output method.

#!/usr/bin/perl
use strict;
use warnings;
use Term::ANSIColor;

# Mandelbrot Set Renderer

# Configuration parameters
my $width = 80;   # Width of the output
my $height = 40;  # Height of the output
my $max_iterations = 100;  # Maximum iteration count

# Mandelbrot set calculation function
sub mandelbrot {
    my ($c_real, $c_imag) = @_;
    my $z_real = 0;
    my $z_imag = 0;
    
    for (my $i = 0; $i < $max_iterations; $i++) {
        # Mandelbrot iteration: z = z^2 + c
        my $new_real = $z_real * $z_real - $z_imag * $z_imag + $c_real
+;
        my $new_imag = 2 * $z_real * $z_imag + $c_imag;
        
        $z_real = $new_real;
        $z_imag = $new_imag;
        
        # If magnitude exceeds 2, it's not in the set
        return $i if ($z_real * $z_real + $z_imag * $z_imag > 4);
    }
    
    return $max_iterations;
}

# Render the Mandelbrot set
sub render_mandelbrot {
    for my $y (0 .. $height - 1) {
        my $line = '';
        for my $x (0 .. $width - 1) {
            # Map pixel coordinates to complex plane
            my $real = ($x / $width) * 4 - 2;     # X-axis from -2 to 
+2
            my $imag = ($y / $height) * 4 - 2;    # Y-axis from -2 to 
+2
            
            my $iterations = mandelbrot($real, $imag);
            
            # Color/character selection based on iterations
            my $char;
            if ($iterations == $max_iterations) {
                $char = colored('#', 'black');  # Points inside the se
+t
            } else {
                # Gradient coloring based on iteration count
                my $color = _get_color($iterations);
                $char = colored('*', $color);
            }
            
            $line .= $char;
        }
        print "$line\n";
    }
}

# Color selection function
sub _get_color {
    my ($iterations) = @_;
    my @colors = (
        'red', 'green', 'yellow', 'blue', 
        'magenta', 'cyan', 'bright_red', 'bright_green'
    );
    return $colors[$iterations % scalar(@colors)];
}

# Main execution
print "Mandelbrot Set Visualization\n";
render_mandelbrot();
[download]

Supported:
Bash
C
C++
C#
Dart
ECMAScript
Elixir
Erlang
Go
Java
JavaScript
Kotlin
PHP
Python
Python3
Racket
Ruby
Rust
Scala
Swift
TypeScript

In perl.perl5.porters, Philippe Bruhat wrote:

I'm very sorry to be the bearer of sad news, which I just learned
from a co-worker who was in regularl contact with Zefram.

He forwarded me this:
We are sad to announce that Zefram (Andrew Main) died yesterday
(2025-03-10) after being hit by a train. Further details are not yet
available. Everyone close to him is very shocked by this and contact
details and further arrangements will be announced in future.
He was a long-time and prolific contributor to Perl core and CPAN,
and he will be missed.

I will forward further details (memorial or place to send condolences)
as I receive them.

Christian Walde then followed up with:

Thanks for bearing the news BooK, even if it is sad news.

As an additional bit of info, his personal website's section on this 
matter is relevant: https://www.fysh.org/~zefram/personal/death

brew install pkg-config

brew install libpng
pkg-config --cflags libpng
cpan Imager::File::PNG

brew install jpeg
pkg-config --cflags libjpeg
cpan Imager::File::JPEG

brew install giflib
cpan Imager::File::GIF

GIF: Test code failed: Can't link/include 'gif_lib.h', 'stdio.h', 'errno.h', 'string.h', 'gif'...
! Configure failed for Imager-File-GIF-0.98. See /Users/you/.cpanm/work/1713652269.80239/build.log for details.

cd /Users/you/.cpanm/work/1713652269.80239/Imager-File-GIF-0.98

perl Makefile.PL -v --incpath=/opt/homebrew/include --libpath=/opt/homebrew/var/homebrew/linked/giflib/lib

make
make test
make install

o conf makepl_arg "LIBS=-L/opt/homebrew/var/homebrew/linked/giflib/lib INC=-I/opt/homebrew/include"

sudo /usr/libexec/locate.updatedb

locate giflib
/opt/homebrew/var/homebrew/linked/giflib

locate gif_lib.h        
/opt/homebrew/Cellar/giflib/5.2.1/include/gif_lib.h
/opt/homebrew/include/gif_lib.h

cpan -M https://www.cpan.org -a
[download]

Task 2: Submatrix Sum
Submitted by: Jorg Sommrey

You are given a NxM matrix A of integers.

Write a script to construct a (N-1)x(M-1) matrix B 
having elements that are the sum over the 2x2 submatrices of A,

b[i,k] = a[i,k] + a[i,k+1] + a[i+1,k] + a[i+1,k+1]


Example 1

Input: $a = [
              [1,  2,  3,  4],
              [5,  6,  7,  8],
              [9, 10, 11, 12]
            ]

Output: $b = [
               [14, 18, 22],
               [30, 34, 38]
             ]
[download]

I tried to crank it up for entertainment -- to solve not "2x2", but arbitrary "WxH" sub-matrices of (relatively) large matrices. Sadly, it was too late into many stupid plots and tables, when I realized, that excessive summation isn't required at all. Sliding (moving) sum (or average, min/max, etc.) is a well known concept -- duh! not to un-educated me, alas. And so maybe "2x2", not "WxH", in the task, was selected not only because PWC tries to accommodate new learners. Anyway, I implemented "sliding submatrix sums" algorithm only at a later stage, in PDL, and didn't "backport" it to pure Perl (nor Pdlpp) because had already been somewhat fed-up with this 248-2, but decided to present sanitized results as a meditation.

Disclaimer: it's clickbait. The plot is curved, solution isn't linear, despite lack of nested loops, -- but fast.

Task 2: Group Hero
Submitted by: Mohammad S Anwar

You are given an array of integers representing the strength.

Write a script to return the sum of the powers of all possible 
combinations; power is defined as the square of the largest number 
in a sequence, multiplied by the smallest.

Example 1

Input: @nums = (2, 1, 4)
Output: 141

Group 1: (2) => square(max(2)) * min(2) => 4 * 2 => 8
Group 2: (1) => square(max(1)) * min(1) => 1 * 1 => 1
Group 3: (4) => square(max(4)) * min(4) => 16 * 4 => 64
Group 4: (2,1) => square(max(2,1)) * min(2,1) => 4 * 1 => 4
Group 5: (2,4) => square(max(2,4)) * min(2,4) => 16 * 2 => 32
Group 6: (1,4) => square(max(1,4)) * min(1,4) => 16 * 1 => 16
Group 7: (2,1,4) => square(max(2,1,4)) * min(2,1,4) => 16 * 1 => 16

Sum: 8 + 1 + 64 + 4 + 32 + 16 + 16 => 141

1. They spelled it: PERL
2. Raptors are extinct.
3. Raw onions? C'mon!

I want cool cryptic, like Perl itself:

$Perl->{5.36}

Obviously: camel code