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

Sometimes, we want to extend the functionality of a class that is declared `final`. For example, to have a string that has the `hidePassword()` function.

One way to achieve that is to declare a class that wraps the string for us:

data class Password(val password: String) {
    fun hidePassword() = "*".repeat(password.length)
}


This solution is quite wasteful, though. It adds another level of indirection. 

In Kotlin, there's a better way to implement this.

To extend a class without inheriting from it, we can prefix the function name with the name of the class we'd like to extend:
```
fun String.hidePassword() = "*".repeat(this.length)
```
This looks almost like a regular top-level function declaration, but with one crucial change---before the function name comes a class name. That class is called a **method receiver**.

Inside the function body, `this` will refer to any `String` class that the function was invoked on.

Now, let's declare a regular string and try to invoke this new function on it:








Explore the extension functions and learn how to use them to extend the functionality of a class in Kotlin. 


Extension Functions

Explore the extension functions and learn how to use them to extend the functionality of a class 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

Extension Functions