A memory leak is an unintentional, uncontrolled, and unending increase in memory usage. No matter how small, eventually, a leak will cause your process to run out of memory and crash. Even if you periodically restart your app to avoid this crash (no judgment, I've done that!), you still suffer the performance implications of a memory leak.

There’s a function called Enum.map in Elixir that works on multiple collection types, but it's not without its issues. In this post, I will introduce you to a concept from functional programming called a functor. We’ll make a Functor protocol with a function called fmap that will aspire to be a better version of Enum.map. Note: The article is inspired by the Witchcraft library, which we covered in one of our previous posts. But first: what's the problem with Enum.map exactly?

Computers are becoming more powerful, thanks to GPUs and multi-core CPUs. Equally, applications are getting more complex as they leverage threads (independent execution units in a process) for maximum application performance and responsiveness. In this article, we will explain what multithreading is, and how Node.js handles asynchronous operations using the event loop and worker pools. We'll also discuss how to use the Node.js worker-threads module to create and manage threads. Let's get started!

This is the first part of a two-part series about maintainable code in Elixir. In this part, we will show how code predictability plays a crucial role in a project's short and long-term health. We will use Elixir's built-in features for this, like the pipe operator, tuples, and with blocks. First, we'll explain what predictability is and why it is so important. Then we will go through some tools that Elixir already has and how you can use them to write better code.

In this article, we will configure Capistrano in a Ruby on Rails application. We will then deploy the app to a cloud instance that runs Ubuntu as an operating system, independent of your hosting provider. You can use any cloud service, or even an on-premises server, to test or replicate the steps we'll take. Once we've deployed the app, we'll look briefly at how you can monitor your app's deployments using AppSignal. But first, you might ask: why should I use Capistrano in the first place?

Writing tests for an application is the most difficult but necessary element of a development process. Tests ensure correct code maintenance and enhanced code quality. In this tutorial, we’ll show the best way to handle side effects in your Node.js applications. But first, let's define side-effects.

Hotwire is a hot topic at the moment for every Rails developer. If you work with Rails, there is a good chance you have already heard a lot about it. Hotwire is a completely new way of adding interactivity to your app with very few lines of code, and it works blazing fast by transmitting HTML over the wire. That means you can keep your hands clean from most Single Page Applications (SPA) frameworks.