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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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

## Handling URLs with the routing block

Now, let's take a look at the `routing` block:

```
routing {
    get("/") {
       call.respondText("OK")
    }
}
```
This block describes all the URLs that will be handled by our server. In this case, we only handle the root URL. When that URL is requested, a text response, `OK`, will be returned to the user.

The above code returns a text response. Now, let's see how we can return a JSON response instead:

```
get("/status") {
    call.respond(mapOf("status" to "OK"))
}
```
Instead of using the `respondText()` method, we'll use `respond()`, which receives an object instead of a string. In our example, we're passing a map of strings to the `respond()` function. If we run this code, though, we'll get an exception. This is because, by default, objects are not serialized into JSON.


Learn how to handle the routing requests in a Ktor application.


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

Routing Requests

Handling URLs with the routing block