Class inheritance is a fundamental OOP (Object-Oriented Programming) feature that helps you create a more specific & specialized version of any class. Here’s an example: Food -> Fruit -> Orange There’s a relationship between these classes! We can say that an orange is a fruit, but fruits are also food. The parent class (also called … Read more
An environment variable is a key/value pair, it looks like this: We use these variables to share configuration options between all the programs in your computer. That’s why it’s important to learn how they work & how to access them from your Ruby programs using the ENV special variable. Examples of environment variables: You can … Read more
A matrix is a 2D (2-dimensional) array that can be used to store & work with spreadsheet-like data. They can be used for: Representing a board in a table game (chess, checkers, etc.) Statistics & data analysis Generating plots & graphs Because this is a powerful data structure it’s helpful to learn how to use … Read more
In this article you’ll learn how the Ruby inspect method works & why do we use it. When you print a string or array you see its contents. Example: puts [1,2,3] 1 2 3 But when you print your own objects… You see this: #<Cat:0x29458e0> Why? Because you haven’t told Ruby how to display this … Read more
Many people forget that Ruby can do things that aren’t web applications. In this article, I want to show you how to build a command-line application to help remedy that! Here are some command-line applications you may be familiar with: There are many ways to build a command-line application & in this article we are … Read more