Gain insights into Kotlin language essentials and delve into design patterns and best practices. Discover functional programming techniques to enhance code reuse, robustness, and build reliable, scalable projects.

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Kotlin_optimized.tar.gz

Kotlin

Kotlin_Co

Kotlin_SPA

Cats_Hostel

Cats_Shelter(1..5)

Cats_Shelter(6-7-8)

Design patterns enable developers to speed up the development process by providing proven development paradigms. Reusing design patterns helps prevent complex issues that can cause major problems. Moreover, it improves your codebase, promotes code reuse, and makes an architecture more robust.

In this course, you will start with a gentle introduction of the Kotlin language. You will explore design patterns that are part of the best practices that help developers use Kotlin efficiently. Design patterns appeared in the era of object-oriented languages such as C++ and Java. You will learn the language features that Kotlin provides, which allow developers to program in a functional style and implement the design patterns.

After taking this course, you’ll be able to take your knowledge of Kotlin, design patterns, and associated best practices to the software industry and apply it to build reliable, scalable, and maintainable projects.

Kotlin Design Patterns and Best Practices

## Adding the dependencies
Now, we need to add the following dependencies to our `build.gradle.kts` file:
```
val vertxVersion = "4.1.5"
dependencies {
    implementation("io.vertx:vertx-core:$vertxVersion")
    implementation("io.vertx:vertx-web:$vertxVersion")
    implementation("io.vertx:vertx-lang-kotlin:$vertxVersion")
    implementation("io.vertx:vertx-lang-kotlin-
coroutines:$vertxVersion")
...
}
```
All the dependencies must be of the same version to avoid any conflicts. So, we're utilizing a variable for the library version with the intention of modifying all of them simultaneously.

The following is an explanation of each dependency:
* `vertx-core` is the core library.
* `vertx-web` is needed because we want our service to be REST-based.
* `vertx-lang-kotlin` provides idiomatic ways to write Kotlin code with Vert.x.
* `vertx-lang-kotlin-coroutines` integrates with the coroutines.

## Starting the server
Go to the `App.kt` file and add the following code:

```
fun main() {
    val vertx = Vertx.vertx()
    vertx.createHttpServer().requestHandler{ ctx ->
           ctx.response().end("OK")
    }.listen(8081)
    println("open http://localhost:8081")
}
``` 

That's all we need to start a web server that will respond with OK when we run the application.

Learn how to start the server in a Vert.x application in Kotlin.

Getting Started with Kotlin

Working with Creational Patterns

Understanding Structural Patterns

Getting Familiar with Behavioral Patterns

Introducing Functional Programming

Threads and Coroutines

Controlling the Data Flow

Designing for Concurrency

Idioms and Anti-Patterns

Concurrent Microservices with Ktor

Reactive Microservices with Vert.x

Conclusion

Adding Dependencies and Starting the Server

Adding the dependencies