New Perl project. Interactive Perl coding tasks to run in the browser

Some time ago I have created a small web project about Perl programming language. The site where you can execute Perl code online — (blog post about the release)

Today I'm happy to announce the new small project about Perl. This is the place with interactive coding tasks. You solve the task, enter the solution, system run it and tell you if it accept your submission. ( is used as a backend to run Perl code)

This is the link:

Now there are only several tasks. The source code for all the all tasks is hosted on GitHub, so anybody can propose a fix for the task or create the new task.

I'm very happy that it is possible not only to create a task "write a script", or "write a sub", but also a type of task "write one-liner". I use Perl in the command line a lot, I think this is a very strong side of Perl and I want to make it possible to create tasks about one-liners.

This is the very first version of the project. There are a lot of things that I think should be done better (for example I really don't like that the system does not explain what is wrong with your submission, it just tell you that it does not accept it). But I think that this version is good enough to show to you and to listen to your feedback.

This is something like or But it is million times smaller and dedicated to Perl.

There is a great project created by Mohammad Sajid Anwar — Perl Weekly Challenge. It is dedicated to Perl & Raku and it about solving Perl tasks. I really like the ideas behind this project and I'm fascinated how this project inspires people to write blog posts about the tasks. (And I'm also impressed how much handwork Mohammad is doing) I really like it, but I don't use it for a couple of reasons: I want to be sure that I have solved the task correctly. I want the system run tests for my solution and to check that it is working exactly as planned even in corner cases. The other thing — I want more freedom. Sometimes there are weeks that I'm not able to spend time on this challenge, but sometimes I have time and I'm in the mood to spend several hours with solving problems. So as an experiment, or you can call it as as a proof of concept I've created the new project.

I'm planning to add more interactive problems to the site.

Information about new tasks will be posted on, so, If you are interested, you can follow that account. Or, you can watch GitHub repo to get notifications about the changes in the tasks.

I would love to hear from you what you think. Do you like it? Do you think that it should be done in some other way?


It should be "Interactive Perl problems".

Wow, this is great! It's kind of difficult to type into the input field though:

1. My auto-correct "helped" me by turning $I into $I. This site says that can be turned off by adding autocomplete="off" autocorrect="off" autocapitalize="off" spellcheck="false" to the textarea:

2. The Tab key changes focus. There are in-browser editors you could use to fix that, but I find that the friendliest thing to do is just to allow the Tab key to insert a tab. This StackOverflow post has a few ways to do it:

Great job so far! I look forward to seeing what else you come up with!

This is fun Perl quiz!

I registered and login it now.

Can I register my Perl problem from Web Interface?

Suggest this change:

The solution that you have entered does not work as expected. See the PerlBanjo link above for errors.

But THANK YOU! Now I can stop using perl -e at the command line for short snippets that invarialbly become programming sessions!

thank you.

>If you are asking about the interface to add new problems to the system, there is no such interface.

I understand current features now.

I feel if a problem is added from web form, and answers are also added from web form, it will become interactive communication by a teacher and students.

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About Ivan Bessarabov

user-pic I blog about Perl.