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When you have a module that you include in other classes, the way you test it might not be obvious. This is what I’m going to show you in this tutorial.

A common source of confusion when using RSpec is whether to use let, let!, or an instance variable, for storing state. In this article I’ll try to explain the difference between let, let!, and instance variables so you know which one to choose.

Do you find unless to be confusing? I know I do. Especially if it’s combined with one or more boolean operators.

The Ruby sort method works by comparing elements of a collection through the spaceship operator, and using the quicksort algorithm.

The term comes from the world of functional programming, and it’s often paired with map. You’ve probably heard the term map/reduce if you’ve been in the programming world for more than a few months.

The Ruby Enumerable module deserves the top spot in the popularity contest. It packs so many great methods that it’s hard to think of an application that wouldn’t use it.

I think it’s so cool that the Ruby map method exists. It means that Ruby has support for higher-order functions, and functional programming.

I remember when I first heard about strings. I wanted to create a command line application that would ask the user for his name and age.

Arrays are probably the most popular data structure you’re going to use in Ruby. Learn what you can do with them and how to use them effectively.

When it comes to doing the same thing over and over again, Ruby has a few methods you can choose from. But in this article we’re going to look at the each method and what you can do with it.