I always have to search how to generate a random integer number between a range because this is a common task that I use a lot in tests, but really, I can't memorize it.
Though, this is how I would do it in 2021.
use v5.16;
use strict;
use warnings;
# Class definition
package Random::Range {
use Zydeco;
class Integer {
method pick ( Int $min, Int $max ) {
return $min + int ( rand ( $max - $min ));
}
}
}
# Script
say Random::Range->new_integer->pick(1, 100);
#==> 42
So what did we do here? We used the rand function where we applied the int function, so we would get an integer, not a fractional number. The small calculation makes possible to restrict the result to the desired interval.
All of this is glued into a minimal Zydeco class that adds a very nice object-oriented interface. You maybe don't need Zydeco, this simple one-liner would work:
perl -le 'my @interval = (1, 100); print $interval[0] + int ( rand ( $interval[1] - $interval[0] ))'
Note this is not cryptographically secure and should only be used in simple cases: if you need a secure implementation, please check some appropriate solutions on CPAN.
Art: digital painting by myself.
Top comments (8)
How are you doing the digital painting?
It's not computer generated through Perl unfortunately. I did it by hand, using Krita and a watercolor brush, plus adding more water on the "fresh" painting I guess. Actually I don't remember all the details very well and would maybe not be able to redo it again. Easier than real brushes and canvas that's all I know.
By hand = with a drawing tablet?
Maybe but not sure because it is basically like trashing a bucket of painting on a canvas. It's more likely I did it on my ThinkPad trackpad or something.
The sources are here tknk.io/Aafd
I have to agree with your one-liner; writing a whole class for this seems a bit much.
Yer, I guess it is overkill, plus, some people could find it slow (me I have time, 1 second is ok to me to get a random number).
The idea is also to show off a bit of the Modern Perl™ OOP capabilities, maybe some people would be like « oh, this is Perl? It changed! ». Because I feel like Zydeco is an already usable OO system that is the closest to what Corrina seems to become. We will have to wait a bit more before being able to play with the "modern" core OO capabilities, but this is totally usable.
Those people need to realize you don't always need OO. One of Perl's strengths is that it's multi-paradigm: you use the style that best fits the problem.