Have you ever wanted to create a class that can only have one instance? Yes? No? Maybe? Well… That’s exactly what the singleton pattern is. There isn’t a problem with that. But some people call this an anti-pattern because it can be used as an excuse for bad design. Let’s have a look at a … Read more
Two of the most important object-oriented principles are cohesion & coupling. Cohesion is about the relationship between all the methods inside a class. Are they using the same set of instance variables & parameters, all working together towards the same goal? Or does every method feel separate from each other? Coupling is how dependent is … Read more
Let’s talk about the strategy design pattern! This design pattern helps you change the main algorithm inside a method. You do this by passing in a class that implements this algorithm, instead of hardcoding it into the class. And when I say algorithm I don’t mean a fancy computer science algorithm, but any code that … Read more
What is the decorator design pattern? And how can you use this pattern in your Ruby projects? The decorator design pattern helps you enhance an object by adding new capabilities to it without having to change the class. Let’s look at an example! Logging & Performance In this example we are making HTTP requests using … Read more
There are a few articles out there about how to find memory leaks. But how about creating one? I think it will be an interesting exercise so you know what a memory leak looks like in Ruby. Let’s see some examples. A Simple Leak We can create a memory leak by simply adding new objects … Read more