Let's Read the Turbo Source: What Happens When You Click a Link? Reading the source code is one of the best ways to learn how a feature, framework, or a program works. In this post, we'll explore the source code of Hotwire's Turbo library to understand exactly what happens when you click a link. I hope you'll appreciate Turbo much more after this deep dive.
Let's Implement the Map Method from First Principles Those new to functional programming often wonder when to use higher-order functions (or blocks/procs/lambdas in Ruby). I did, too. In this post, we'll implement the map method from scratch, in turn gaining an intuitive understanding of higher-order functions and when to use them.
Rails Database Migrations Cheatsheet The database schema evolves continuously. Rails migrations is a powerful and flexible way to update the schema without dropping and re-creating the database. However, all this power and flexibility can be overwhelming. Here's a handy cheatsheet for most common migration operations.
Practical Stimulus: Building a Counter Component In this article, we will build a counter component using the Stimulus JavaScript library. This simple example will demonstrate a bunch of useful features of Stimulus such as managing state, handling events, and targeting DOM elements.
Ruby's Hash is a Swiss-Army Knife A Hash is a built-in data structure in Ruby that maps values to keys and has a constant-time O(1) lookup. This article shows the capabilities of this simple, but equally powerful tool. We’ll start with the basics but also cover some obscure but equally useful features of hash.
Abbrev: A Hidden Ruby Gem The Abbrev module in the Ruby standard library helps you find out all the possible and unique abbreviations for one or more strings. In this post, we'll learn how it works along with a practical example. We'll also take a peek behind the scenes to see how it's implemented.
Using Zeitwerk Outside Rails Did you know you can use Zeitwerk outside Rails? This article shows how to use the Zeitwerk gem to autoload classes and modules in a Ruby app that's not using Rails. We'll also learn how Rails configures Zeitwerk internally and introduce the concept of models in our no-rails Ruby web application.
How to Implement Content Security Policy in Rails This article shows how to implement content security policy in your Rails applications to protect against cross-site scripting (XSS) vulnerability. We'll also learn how you can report CSP violations without enforcing the policy and make exceptions for inline scripts with nonce attributes.
You Don't Need Rails to Start Using Hotwire Although Hotwire is closely tied to Ruby on Rails, you might be surprised to know that you don't really need Rails to learn, play, and experiment with Hotwire. In this article, we'll build a simple static site that uses Turbo Drive + Frames to make it responsive and use Streams to make it dynamic.
Content Security Policy (CSP): What Every Web Developer Must Know This is a comprehensive guide to Content Security Policy (CSP). If you build websites for a living, CSP is an important concept to know, understand, and implement to protect your users from Cross-Site Scripting (XSS) Injection attacks. This post covers (almost) everything you need to know about CSP.
Logging in Ruby: (Almost) Everything You Need to Know Like backups, logging is one of those topics that seems unnecessary until something goes wrong! It's very frustrating to fix a bug that's only reproducible in production without having any logs to help you debug it. This post covers the basics of logging in Ruby and adds logging to our no-rails app. This article is for Members only
How to Dynamically Create Instance Variables in Ruby This post shows one way to dynamically initialize multiple instance variables in a Ruby class using metaprogramming. If you need to pass multiple, separate pieces of data to a constructor (and cannot refactor the code for some reason), it's a pretty good technique to reduce all the repetitive code.