Kotlin documentation as PDF Kotlin Documentation

Many startups and Fortune 500 companies have already developed Android applications using Kotlin, see the list on the Google website for Android developers. You can use Kotlin along with the Java programming language in your applications without needing to migrate all your code to Kotlin. Kotlin Multiplatform allows development for not only Android but also iOS, backend, and web applications.

Kotlin developer guide

Along the way, you’ll get to play with both object-oriented and functional programming. If you want to really understand Kotlin, this is the book for you. According to JetBrains, there are approximately 200 Kotlin user groups and numerous online forums where Kotlin enthusiasts can discuss ideas and help each other. Also, more than 450 developers are contributing directly to improve the overall ecosystem of Kotlin. Having such an extensive community that is highly active makes Kotlin stand out firmly among the most valuable programming languages of the 21st century. It is yet another outstanding feature of Kotlin that makes it a great choice for Java developers.

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This book will change the way you code — and give you back some of the joy you had when you first started. Even Google has adopted it as a first-class language for Android development. Starting from first principles, you will work your way to advanced usage of Kotlin, empowering you to create programs that are more reliable with less code. The book is written by Dmitry Jemerov and Svetlana Isakova, developers on the Kotlin team.

Kotlin developer guide

If you want to develop Android apps by learning Kotlin, then try this insightful resource. It teaches you how to move from Java to Kotlin and how you can give better control over asynchronous computations through Kotlin. This Kotlin Masterclass by Udemy claims to make an expert programmer from a beginner by teaching you the fundamentals and advanced topics of Kotlin. Participants here get the chance to work on various exercises, projects, and challenges after each concept. The learning content has been designed following responsive development to support smart TVs, mobiles, tablets, and computers. It takes a week to travel the 8,000 miles overland from Java to Kotlin.

Interoperable with Java

You also explored what Kotlin is, and the history of the Kotlin language. You also learned about the features of the Kotlin language, its uses, and the companies that use the Kotlin language. A data class is a class that does not perform any operation and only contains a state.

  • If you are interested in developing an in-depth knowledge of Kotlin, the best bet for you is to leverage the official Kotlin documentation.
  • You’ll learn everything from language fundamentals to collections, generics, lambdas, and higher-order functions.
  • This site is the official documentation for the language, and we need to be able to ensure that all the information here is correct and up-to-date.
  • Also, I tried to be concise by favoring commented snippets over long explanations.
  • As a beginner, you may wonder if you’ll be able to learn Kotlin without facing any significant challenges.
  • It highlights whatever you have learned and also certifies that you have a sufficient understanding of a subject to work in a professional environment.

Kotlin was introduced by the company Jetbrains in the year 2010 and was open source since 2012. But we should always mention return type whenever we’re returning a value. Kotlin is statically typed, meaning the type of every expression in the program is known at compile time. Note that KDoc does not have any syntax for resolving overloaded members in links.

A Basic To-Do List Application

Also, this tutorial is among the top-rated tutorials available on Udemy, with more than 145K students enrolled for it. It is a full-length course available on Udemy that consists of several video tutorials. It majorly focuses on the Kotlin concepts used in Android development, and thus, it is an apt course for anyone interested in becoming an Android developer. Dr Hussein Alrubaye is the creator of this course, and he currently works at Microsoft as a senior software engineer.

It comes with clear examples, detailed explanations, and exercises so that you can know your subject well. The topics covered in this book range from basics like types and data structures to advanced ones like stream processing. Furthermore, it makes you familiar with the IntelliJ IDEA development environment of JetBrains. After finishing this book, readers can create powerful apps using Kotlin.


If you consider the most popular programming languages, you will notice that most are quite old. While they have evolved by adding advanced features and capabilities, they can still not be fully compared with a modern programming language like Kotlin. Google announced Kotlin language as an official language for developing android applications in May 2017. After the announcement, the jobs for Kotlin increased in large numbers; since then, the job opportunities for Kotlin have doubled every three months as per Dice. Google, Netflix, Pinterest are some of the companies using Kotlin. This book on Kotlin is a handy resource for designing and writing Kotlin applications.

Today, Java is really popular for backend development and Kotlin can be used for any kind of server development. Whether it is web apps that serve HTML content, a backend https://wizardsdev.com/en/vacancy/android-kotlin-developer/ for REST APIs or Microservices, Kotlin can do the job. Not only that, thanks to the Kotlin JavaScript compiler, it can also be used for building frontend web Apps.

Time to level up.

If we know that the item can be null then we should use nullable types with NullPointerException handling. In Kotlin, variables are declared using var keyword and constants are declared using val keyword. Member functions always take precedence if they share the same signature. A type without a question mark denotes that variables of such type can’t store null references.

Kotlin developer guide

But the best part is that you can have Kotlin side-by-side with the existing Java code. There’s nothing preventing you from writing half of your project in Java and the other half in Kotlin. Since JVM only knows about Java bytecode, running apps written in Kotlin is no different from how they are written in Java. The development of the Kotlin language was announced in the year 2011.

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