What programming language is used for examples in the book?

I wanted the book to be language-agnostic, therefore I decided not to have examples in a specific programming language. All code examples within the book are given are in pseudocode which looks similar to any modern OOP language.

However, you also get an archive with the real code examples along with the book. It contains examples in 7 programming languages: Java, C#, PHP, Python, Ruby, Swift, TypeScript.