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

The goal of the **Deferred Value** design pattern is to return a reference to a result of an asynchronous computation. A Future in Java and Scala, and a Promise in JavaScript are both implementations of the Deferred Value design pattern.


Interestingly enough, the Deferred Value itself is an implementation of both the Proxy design pattern and the State design pattern.

We can create a new container for the result of an asynchronous computation using the `CompletableDeferred` constructor:
```
val deferred = CompletableDeferred<String>()
```
To populate the `Deferred` value with a result, we use the `complete()` function, and if an error occurs in the process, we can use the `completeExceptionally()` function to pass the exception to the caller. To understand it better, let's write a function that returns an asynchronous result. Half of the time the result will contain `OK`, and the other half of the time it will contain an exception.



Learn how to implement the Deferred Value design pattern 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

Deferred Value Design Pattern