Practicing Recursion with a Guess the Word Game

Let’s build a guess the word game using recursion!

Breaking the rules when writing unit tests

This is part 3 in a series on unit testing in Elixir. In this post, I show two of the places where I break some of the rules that I set out earlier when I’m writing unit tests:

nerves_neopixel is now Blinkchain!

If you want a fun project to hack on over the upcoming holiday, pick up some NeoPixel RGB(W) LEDs for your Raspberry Pi-based Elixir/Nerves device and check out the latest release of blinkchain (formerly known as nerves_neopixel). It now supports commands to draw on a mutable 2D virtual canvas (e.g. composed of a bunch of strands or one or more Pimoroni Unicorn hats) instead of having to calculate the updated values for all LEDs manually each “frame.”

Check out the example and let me know what you think!

ElixirWeekly: The Elixir Community Newsletter, covering community news you easily miss, shared on ElixirStatus and the web, in one email every Thursday.

How Learning Elixir Made Me a Better Programmer

My notes on learning Elixir and how it helped me with my day job, where I dont write Elixir.

Morphix 0.5.0 released, now with unordered equality!

We sometimes run into a problem where we want to compare two enumerables for content, irrespective of ordering. So we’ve added equalify and equaliform (recursive version) methods to morphix to handle that situation.

Map vs List Performance

An optimization I made to use a map instead of enumerating through lists to match elements of a big dataset took the operation time from 30+ minutes to less than a second.

just released erlang-rocksdb 0.26.0, a binding of rocksdb embedded K/V database

This version is using cmake for the build and allows you to customize your installation by reusing the libraries installed on your system:

also available on :


The Best of Access @ Elixir

Re-introduce the Access module, composable & extensible abstraction to get & update deep nested data.

Viberex: Viber REST API wrapper in Elixir

Viberex is Viber client that helps to create Viber bot in Elixir.

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.

Analyzing Phoenix performance using Graylog — Developers Bat mobile — Metadata.

Built Custom metrics, and custom analytic based on top of graylog.

u2f_ex: A pure-elixir u2f implementation

Hey! Just wanted to announce v0.4.0 of u2f_ex. You can find it here: or through hex:

ElixirMix Podcast 030 - Writing Great Unit Tests with Devon Estes

In this episode of ElixirMix, the panel talks with Devon Estes about testing in Elixir. Unit tests, integration tests, outside-in, coverage, GenServers, the “right level” and much more!

Podcast Episode

Build a Simple Persistent Key-Value Store in Elixir, using Logs - Part 2

In this part we’ll do a step further, making both keys and values persistent. Taking inspiration from the Bitcask design, we will see how to enhance our implementation and to recover the Index in the case of a failure.

String.to_existing_atom/1 is a double-edged sword

I’d argue Elixir has relatively few gotchas. It’s a simple and consistent language and when you first learn it there’s only a few things that are genuinely counter-intuitive and catch you by surprise…

Leandro Bighetti - How to teach Elixir to non-functional developers - Code BEAM Lite Berlin 18

TMIB-23: This November, a few scalability problems were fixed

🎄 Advent of Code with Elixir, Day 1

For this year’s Advent Of Code, I will be posting my solutions in Elixir with a breakdown of how the functions work and things I learned along the way.

Day 1:

Assertions - helping you write better tests

Today I published a new package where I’ll collect all the best and most helpful assertions to help you write better tests! I add some version of these to pretty much every project I start.

The package is called, fittingly enough, assertions:

EMx 028: Elixir, Node, and Bitcoin with Pete Corey

I was on a recent episode of Elixir Mix. We talked about a wide range of Elixir-related topics, and how I’m putting Elixir to good use in two of my ongoing projects.

IEx Remote Shell into your Elixir driven GRiSP Board

More bare metal Elixir. This time we open a remote terminal into our GRiSP application over a wifi connection.