Kotlin Multiplatform, Encounter with the Unknown

Experience the hands-on session from INFCON 2022
as a lecture! 🥰

Kotlin Multiplatform, Encounter with the Unknown ✨

Kotlin was first released in February 2016 as a multi-paradigm, multi-platform programming language that emphasizes safety, conciseness, and interoperability. Although it started with the goal of providing a better alternative to Java, it has since grown significantly and is now used in various development fields, including Android, desktop, and server-side solutions.

As mentioned earlier, Kotlin is a programming language that supports multi-platform development. Kotlin already works well on platforms that support the JVM (Java Virtual Machine), and for platforms that do not support the JVM, you can use Kotlin/Native. Kotlin/Native compiles Kotlin into binaries that run on iOS, macOS, Windows, and Linux. For the web, it compiles into JavaScript and HTML. Using this, you can write multi-platform applications—ranging from mobile to web, desktop, and server—with a single codebase that shares Kotlin code.

In this course, we will build a complete web application using Kotlin Multiplatform along with React and Spring. Participants will understand Kotlin Multiplatform projects and further gain light experience in writing shared logic between client and server, as well as Kotlin/JS-based React and Kotlin/JVM-based Spring web programming.

The application we will build together through this course is a To-Do Management Application where users can register, modify, complete, or delete tasks. The core domain logic of this application involves defining a model called "To-Do" and the actions of saving or retrieving that model from a repository. Additionally, we need to create a user interface to manipulate the domain logic via a browser, as well as web and database server logic to process the data.

However, since writing code from scratch that satisfies all the aforementioned requirements would take an enormous amount of time, this course will proceed by completing code snippets within a pre-written template project.

---

Kotlin Multiplatform 🤓

Kotlin is a language that supports multiplatform, allowing it to be used not only for JVM-based server-side and Android development but also in browsers with JavaScript engines, Node.js, and various native platforms such as iOS, Linux, and Windows. Using this, you can write multiplatform applications ranging from mobile to web, desktop, and server with a single codebase that shares Kotlin code.

If you are curious about more details regarding Kotlin and Kotlin Multiplatform, you can find them here.

---

Learning Environment 🖥️

The languages, frameworks, libraries, and tools used in the learning process are as follows.

• Kotlin 1.6.x (with Java 11)
• Share common-code
  • Common Kotlin
  • Kotlin Coroutines
  • Kotlin Serialization
  • Kotlin Logging
  • Kotlin Test
• Client (Front-end)
  • Kotlin/JS
  • React 18.0.x
  • MUI 5.6.x
  • Emotion 11.9.x
  • Ktor 2.0.x
• Server (Back-end)
  • Kotlin/JVM
  • Spring WebFlux 5.2.x
  • Spring Data R2DBC 1.4.x
  • Spring Boot 2.6.x
  • Kotest 5.0.x (with JUnit 5)

---

Instructor Introduction ✒️

- Introducing SpringRunner.

SpringRunner is a training team that helps you build the knowledge and experience needed to develop Spring-based applications.

Developing Spring-based applications requires more learning and effort than one might think. While you can learn the technical aspects of Spring through books and online courses, trying to develop an application using only the knowledge gained this way often leads to feeling overwhelmed. This is because although you have learned how to use the features Spring provides, you lack the experience of actually developing a Spring-based application.

SpringRunner helps participants learn the principles and usage of the Spring ecosystem, including Spring Framework and Spring Boot, and further enables them to master Spring-based application programming that can be applied in practice.

SpringRunner is a name created by combining 'Spring' and 'Guide Runner.'

---