https://twitter.com/mitchhanberg/status/1638170832907141121?s=20

Potion Shop is a Phoenix application vulnerable to common web security issues, such as RCE, XSS, and CSRF.

https://paraxial.io/blog/potion-shop

Episode 143 of Thinking Elixir. New minor LiveView release, a new Nerves focused Elixir case study was published, a post about audio transcriptions using Bumblebee and another about using Tailscale to cluster Elixir apps across cloud providers. ElixirConf US was announced, nimble_options reaches 1.0 and more!

https://podcast.thinkingelixir.com/143

In part two of this three-part series on testing data with Elixir, we’ll look at using data generation functions: https://blog.appsignal.com/2023/03/21/generating-data-functions-in-your-elixir-app.html

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A brief walk-through of functional arrays in Elixir and Erlang: https://readreplica.io/functional-arrays-in-elixir-erlang/

“Programming Machine Learning” guides you through the creation of an image recognition application from scratch with supervised learning, iteratively and step-by-step.

All the code examples provided with the book are in Python/numpy, but I wanted to give Elixir a spin using Livebook, Nx and Axon, therefore I started to rewrite all the Jupyter notebooks in Elixir.

All the livebooks can be found in this Github repository https://github.com/nickgnd/programming-machine-learning-livebooks

In Chris McCord‘s 2nd Phoenix Dev Blog post, he delves into diagnosing and fixing an 8-year old LiveView race condition when long-polling. Even if the bug didn’t affect you personally, his deep dive illuminates how things work as he walks us through the diagnosis and multiple levels of the problem and the final changes. A great guided-tour with insights shared along the way!

https://fly.io/phoenix-files/phoenix-dev-blog-sounds-like-a-bug

Have you ever found it difficult to work with maps that sometimes have string keys (if it’s controller params coming from outside) and sometimes atom keys (if it’s params defined inside of the code)?

If so, consider using our newly published map_with_indifferent_access library, which gives you functions such as MapWithIndifferentAccess.get/3, MapWithIndifferentAccess.put/3, that mimic the Map.* functions.

The advantage of using them is that you don’t have to worry if the map currently uses string or atom keys. You, as the caller, only use atom keys. The underlying code will automatically deduce if the map uses string or atom keys, and depending on it, convert the key to string or leave it as atom, before handing it further to the original Map.* function.

This will prevent you from reaching a Ecto.CastError saying it received a map with mixed key types.

(Inspired by Ruby on Rails’ HashWithIndifferentAccess.)

At Welcome to the Jungle, we have been using Elixir in production for five years now, and in this article we are going to share our feedback on how things have worked out. https://medium.com/wttj-tech/the-benefits-of-using-elixir-for-backend-development-our-perspective-9d421fde426a

Something that never ceases to amaze me about Elixir is that tail call optimization is the trick to having long-lived processes.

In other languages, we’d get a stack overflow.

In Elixir, we get a process that can hold state and send/receive messages.🤩

👉 short video exploring that https://youtu.be/bezaBt5pi7E 👀

:dets allows us to persist items on disk quickly and natively in Elixir, however there is a small chance we can loose data when using this method. In this article we discuss how to create a persistant cache module in Elixir with :dets, why we can lose data and what we can do about it

https://learn-elixir.dev/blogs/avoiding-data-loss-with-elixir-dets

Episode 142 of Thinking Elixir. Orion is an interesting library created by Thomas Depierre that makes it easy to run dynamic distributed tracing in your app on production! It includes a LiveView UI for visualizing the performance and running multiple traces simultaneously. We talk with Thomas to learn more about the history, the inspirations, how it works, why it’s safe to run in production, how to get performance insights, and more!

https://podcast.thinkingelixir.com/142

We can delete LiveView stream elements with stream_delete/3 (already awesome!)

But we need the full record in memory. 😔

What if we only have the dom ID? 🤔

LiveView ships with a stream_delete_by_dom_id/3 function that lets us use the dom_id! 🥳

👀 short video exploring that! https://youtu.be/tg377m24Jls

Posted an announcement on elixir forum about a new lib I’ve released: ExRoseTree - a Rose Tree and Zipper in Elixir with a slew of navigation primitives.

Hopefully it can prove useful to some of you, and if nothing else it may be enjoyable to dig through if you just enjoy data structures. While I’ve deemed it good enough for its first release, there is certainly room for improvement and new features, so don’t hesitate to post issues in the issue tracker, propose feature requests, or contribute to further development.

Thanks, and happy zipping!

Post: https://elixirforum.com/t/exrosetree-a-rose-tree-and-zipper-in-elixir-with-a-slew-of-navigation-primitives/54520

Source: https://github.com/metacode-io/ex-rose-tree

Docs: https://hexdocs.pm/ex_rose_tree/ExRoseTree.html

Blogged on how to use npm to manage all JS dependencies in Phoenix - https://latinum.xyz/posts/phoenix-1.7-with-npm/

Tuesday, March 21, 4pm EST join the founder of Paraxial.io, Michael Lubas, for a live webinar on secure coding in Elixir.

https://paraxial.io/live_rce

Blogged on how to use Mox to test highly concurrent applications (on the Finitomata example.)

https://rocket-science.ru/hacking/2023/03/06/finitomata-mox-testing

Synchronization points. The proper way to test FSM in details: how to control data flow (opinionated approach.)

We recently needed to add authorization to a lot of our context modules. We’ve written a blog post about how we achieved this using macros:

https://nobilisdata.com/blog/using_macros_for_authorization/

Someone asked me how to animate deleting elements in LiveView. The trick is to use LiveView.JS:

• JS.hide/2 with animate option to hide and animate, and
• JS.push/2 to send the event to the server
• ✨ beautiful deletions ✨

👀 https://youtu.be/rMZ6ypeDzjs