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

So, what is the **Observer** design pattern all about? We have one publisher, which may also be called a subject, that may have many subscribers, also known as observers. Each time something interesting happens with the publisher, all of its subscribers should be updated.

This may look a lot like the Mediator design pattern, but there's a twist. Subscribers should be able to register or unregister themselves at runtime.

In the classical implementation, all subscribers (or observers) need to implement a particular interface for the publisher to update them. But since Kotlin has higher-order functions, we can omit this part. The publisher will still have to provide a means for observers to be able to subscribe and unsubscribe.

This may have sounded a bit complex, so let's take a look at the following example.

## Animal choir example

So, some animals have decided to have a choir of their own. The cat was elected as the conductor of the choir (it doesn't like to sing anyway).

The problem is that these animals escaped from the Java world, so they don't have a common interface. Instead, each has a different way of making a sound:


Learn how to implement the Observer design pattern in Kotlin.


Observer Design Pattern

Learn how to implement the Observer 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

Observer Design Pattern