Observer pattern in Kotlin – Design patterns

Have you ever been subscribed to the newsletter? When the author publishes the new issue, it comes straight to your inbox. You can always choose to unsubscribe too.

Why am I asking? Chances are that you’re already familiar with the pattern I’m going to describe today – the observer pattern.

Continue reading Observer pattern in Kotlin – Design patterns

Design patterns – do we still need them?

Design patterns are a set of solutions for the most common problems in software design. The most commonly used patterns came from the book published in 1994. The question is, do we still need them in our modern software projects?

The short answer is: yes, we do. Wanna know the details? Read more.

Continue reading Design patterns – do we still need them?

Console output unit testing in the Kotlin application

Are you looking for a way to test your console output (println()) in your Kotlin project?

In this post, I’m going to walk you through the process of creating a simple project setup that allows you to unit test the console output of the application.

Continue reading Console output unit testing in the Kotlin application

OpenAPI 3 documentation for your Spring REST API with springdoc-openapi

Looking for the OpenAPI 3 compliant documentation for your Spring Boot-based project REST API?

As you know, there are many ways to achieve it (e.g. using the Springfox library). But which solution will be both integrated with the Spring ecosystem and OpenAPI 3 compliant?

Fortunately, the answer is springdoc-openapi. It’s the library that generates documentation almost automatically, without even providing configuration and thousands of cluttering annotations.

In this text, I’m going to show you how you can integrate your Spring Boot project with the springdoc-openapi library to generate nice API documentation which will be compatible with the OpenAPI 3 standard.

Continue reading OpenAPI 3 documentation for your Spring REST API with springdoc-openapi

Spaced repetition algorithm implementation in Kotlin

Have you ever thought about creating your own flashcards app?

Well, I have. Although there are plenty of applications like that I developed a simple one for my personal purposes.

Today I’d like to share the implementation of the SM-2 spaced repetition algorithm in the Kotlin language.

Continue reading Spaced repetition algorithm implementation in Kotlin