Ruby devs are probably all too familiar with seeing this error:
NoMethodError (undefined method `foo' for nil:NilClass)
Most of the time, it’s probably due to a typo, but every now and then we end up having to do something like:
defined?(bar) && bar.foo
# returns nil if bar is nil
If you’re on Rails, or are using ActiveSupport, you can use
Continue reading “Ruby’s Safe Navigation Operator &. and is it a Code Smell?”
If you are into object-oriented programming, you most likely have heard about composition over inheritance. The concept itself is simple: Whenever possible, prefer to compose objects rather than introducing inheritance.
Over years of reviewing Ruby code, the same things tend to come up over and over. In this post, I’d like to address some of the most common code smells I find when reviewing OOP code (and Ruby code in particular).
Continue reading “Common Code Smells in OOP”
Ruby-ish, rubbish… Get it? Anyways, not like Ruby-ish means bad! Quite the opposite!
It’s the day after Xmas and because Ruby is awesome and delivered 2.6.0, we’ll get to play with some of our new Xmas gifts:
Continue reading “A Ruby-ish Xmas”
Have you ever wanted to make your own programming language? Maybe a template engine? A JSON parser? If you have ever built any of those, you might have noticed it’s not exactly easy to get started. We’d like to help with that.
Welcome to Part 3, the final in this series on Writing a Markdown Compiler!
Continue reading “Writing a Markdown Compiler – Part 3”
Hello, and welcome to the second part of the Writing a Markdown Compiler series! In case you’ve need it, here is Part 1, Intro/Tokenizer and Part 3, Code Generation.
In this part we’ll talk about the second step in compiling: Parsing – also known as Syntactic Analysis. This part has a bit more theory, so it might take some time to digest. Sip some coffee, relax, take yout time, and as long as you don’t rush it you’ll find it’s not hard at all. 🙂
Continue reading “Writing a Markdown Compiler – Part 2”
Have you ever wanted to make your own programming language? Maybe a template engine? A JSON parser? If you have ever built any of those, you might have noticed it’s not exactly easy to get started. There are a lot of concepts to digest before you get going. That’s why lots of devs just give up. We’d like to help with that.
Continue reading “Writing a Markdown Compiler – Part 1”
A well-designed Domain Specific Language (DSL) can help you be more productive as a developer, thus making you, your team and your clients happier. In this post, I’ll guide you through the design and creation of a simple DSL to create EPUB files. We’ll start with a regular API and refactoring until we get to a DSL solution.
Continue reading “Writing DSLs: The joy of human consumable APIs”