ThinkingElixir 013: Video chat using LiveView with Jesse Herrick

In episode 13 of Thinking Elixir, we talk with Jesse Herrick about creating a video chat app using WebRTC and Phoenix LiveView. We cover the WebRTC protocol, discuss a number of helpful resources, learn how Phoenix helps accomplish the goal, discuss the JS hooks, pushing events from the server and much more!

Podcast Episode

Prototyping with Phoenix LiveView: A Perfect Play Queue Final Stream

Wrapping up our adventure in prototyping a play queue in Phoenix LiveView by adding group by album view, selection, deletion, and applying a bit more style to the result.

OpenTelemetryDecorator: add OpenTelemetry traces with one line of code

Yesterday I published my first hex package! A decorator macro that lets you add an OpenTelemetry trace to a function, (and specify span name and attributes) with one line of code. For example:

@decorate trace("add", [:a, :b, :result])
def add(a, b), do: a + b

Shameless plug: Check out @elixirstatus' other community project:

Credo, a new static code analysis tool that acts as a code linter, but also focusses on teaching coding practices and code consistency.

Curious Case of String.slice/3: trim by graphemes, by codepoints, and trim like SalesForce does

Putting a string in a tight DB or SFDC field may end up not exactly how expected. Going a bit beyond the standard way of slicing strings in Elixir:

Using Ansible to Deploy Elixir Applications on Dokku

Deploying Elixir apps using Phoenix can be difficult, especially if you are used to ruby git push deploys. Here’s how I used Ansible to deploy a Elixir app using Phoenix on a AWS EC2 instance via Dokku.

Elixir Berlin meetup #75 September

Elixir Berlin meetup #75 September

“Distributed tracing in Elixir” by Yatender

“Be a better parent to your children” by Herminio

Elixir macros return AST

One of the basics in understanding Elixir macros is the fact that Elixir macros return AST.

Elixir Wizards S4E17 Johnny Winn on Kitchen Secrets and Beautiful Coding

Latest episode of Elixir Wizards is out today! Check it out here:

Membrane, Phoenix, Nerves

Binary Noggin released a new post about using Membrane, Phoenix, and Nerves to build a streaming video service.

Shameless plug: Check out @elixirstatus' other community project:

Credo, a new static code analysis tool that acts as a code linter, but also focusses on teaching coding practices and code consistency.

Beware of the Software: A Screencast pt. II

About two years ago I did the first episode of a screencast called Beware of the Software. A couple of days later, I burned out and it was put on a pile of “things to handle later”.

I now feel confident enough to say the second episode is here:

Avrora: explicit split between schema reader and schema writer

Starting 0.13 you can have an explicit split between schema reader and schema writer.

This means that you don’t need to have local files with schemas if you would like to rely only on the schemas already registered in the registry.

config :avrora,
  # ...
  registry_schemas_autoreg: false

If you disable auto registration and have schema registry configured, two major behavior changes will happen:

  1. Local files will be completely ignored for schema resolution
  2. For encoding and decoding, the schema will be retrieved from the registry (see n.1)

For the case when the schema registry is not configured – behavior should remain the same 😉

Also, an Avrora.Encoder module gets some attention and was refactored. It was split into several submodules which implement the same behavior. It allows code to be reused and well tested separately. But everything comes at a cost, hopefully pros and cons should balance each other.

Happy coding everyone and any feedback is welcome 🤗

Highlights from ElixirConf 2020

We put together a roundup of our team’s favorite talks and moments from ElixirConf 2020:

Enumerable: Custom Data Structures in Elixir, part 1

Follow along in beginning to create an Array data structure built on tuples, and learn about the Enumerable protocol.

ThinkingElixir 012: All a Flutter over NIFs and Ports with Connor Rigby

In episode 12 of Thinking Elixir, we catch up with Connor Rigby and learn about his recent Flutter work for Nerves. We take this opportunity to get his perspective on when to choose NIFs or Ports for native integrations, how to make NIFs more portable, get a recommendation for multimedia processing and much more!

Podcast Episode

Elixir Protocols — Implementing Inspect over custom data type

Protocols are one of the concepts we don’t use often in our projects. Check out how we can redesign the output for a specific data type while inspecting.


Protocols are not limited to this feature.

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Prototyping with Phoenix LiveView: A Perfect Play Queue III

This time we went deep into JS / LiveView interop, implemented track position scrubbing, and added intelligent play queue auto-scroll behavior, that shows the currently playing track on the top of the queue, if user doesn’t scroll to a different place manually.

Preparing to Refactor with Better Unit Tests

TL/DR: The last time we looked at this code, we wrote property tests. The property tests used generators to create input, but the actually testing of the invariants was just regular Elixir code. In this post, we’ll look at rewriting those property tests as standard ExUnit tests, giving us better unit tests. Link:

7th video in the series about building cryptocurrency trading bot in Elixir

7th video in the series about building cryptocurrency trading bot in Elixir - this time we will build a BinanceMock application

We will create a new application called BinanceMock. It will have the same functionality as the Binance module so we will be able to use them interchangeably. In the future episode(s) the BinanceMock will become a foundation to allow us to perform backtesting. Besides creating the application itself, we will also modify the leader and the trader to reference the config to figure out which client to use instead of the previously hardcoded Binance module.


Designing For Elixir Compiler Hints

There are some nice new features coming in Elixir 1.11, and one many folks are excited about are some new compile-time checks. The one I’ve heard the most excitment about is the the compile-time check for non-existent fields in structs. But, I’ve got some concerns about how folks might use this and how it might change application design.

Elixir Range— A Strange Experience on Enumeration

Check out a strange experience while enumerating over ranges in Elixir.

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Happy Coding !!