There are three ways to define static functions in Kotlin: !.length // NullPointerException if text == null Kotlin runs on the JVM and compiles down to Java bytecode; you can start tinkering with Kotlin in an existing Java or Android project and everything will work just fine. This is crucial for migrating even large software projects from Java to Kotlin step-by-step and allows developers to use the myriad of Java libraries from Kotlin seamlessly. Before proceeding, optionally clean the project (gradlew clean in the terminal window) and make a backup copy of the project as you cannot convert back from Kotlin to Java.Specify the configurator and Kotlin version to be used by navigating to Tools > Kotlin > Configure Kotlin in Project.. Java and Kotlin runs on Java Virtual Machine (JVM). Kotlin is 100% interoperable with Java. Kotlin eventually compiles down to Java Bytecode, so Kotlin people get all the language sugar and the benefits of Kotlin and Java people are none the wiser. Another way is to give full path as packageName.KotlinFileKt.methodName(). Following are the steps to convert your Java File to Kotlin File using IntelliJ IDEA. What does it mean? 2. Kotlin is well-known for its interoperability with Java. In Kotlin, every class comes with the following methods (can be overridden): Well, we know that Collections are a powerful concept with any programming language; simply put, we can collect similar kind of objects and perform operations with/on them. Naturally, it’s better than Java. Adding Java source code to an existing Kotlin project. What is Kotlin? We just need to remember to use triple quotation marks. Go to the User.java file and convert it to Kotlin: Menu bar -> Code -> Convert Java File to Kotlin File. The first version was launched in 1992. As a matter of fact, Kotlin is an advanced programming language, which handles some modern features like Interoperability. It is a general-purpose, open-source, sterically-typed, cross-platform pragmatic programming language with type inference. Android Studio support. Kotlin is a new programming language, which handles some modern features. Kotlin supports them out-of-the-box using. Kotlin tooling In a Kotlin application, you can have Java files along with Kotlin files. As we can see, semi-colons in Kotlin are optional. Kotlin is 100% interoperable with Java, making it possible to use Kotlin code from Java and vice versa. Select the latest available Kotlin compiler and runtime version. Kotlin is also an object-oriented programming language just like Java developed by JetBrains. Convert a Java file to Kotlin file. Static or global functions are defined separately, outside of the class definitions. From Java To Kotlin - Your Cheat Sheet For Java To Kotlin - MindorksOpenSource/from-java-to-kotlin Change in the 20th century is happening at a faster rate than anyone would have expected. In this tutorial, we’re going to take a look at how we can migrate from Java to Kotlin. In Java: final int a; final int b = 21 ; int c; int d = 25 ; d = 23 ; c = 21; In Kotlin: val a: Int val b = 21 var c: Int var d = 25 d = 23 c = 21. FAQs. Contribute to dkoval/coursera-kotlin-for-java-developers development by creating an account on GitHub. We created a new “Kotlin checker” role for more experienced Kotlin developers to share best practices during code review; this role’s membership gradually increased until it contained all of our Android developers and was no longer necessary. The point of view presented in the article results from the author’s experience. For example, instances of a Kotlin class can be seamlessly created and operated in Java methods. Kotlin also adds some needed features that Java does not support. Best Guidelines, Kotlin Android Tutorial - Learn Android Development with Kotlin, Salesforce Visualforce Interview Questions, Use IntelliJ IDEA Main menu -> Code -> Convert Java File to Kotlin File, You can use the online converter from Kotlin Official Website. If you're converting a Java class that has multiple constructors, the converter will automatically create multiple constructors in Kotlin as well. Step-2: It will show you a popup that some code in the project may require correction and do you want to find and correct such code. Change is inevitable. To convert the existing javacode into kotlin, simply select the src/main/java folder in the project and choose Code->“Convert Java File to Kotlin File”. It also has type inference, meaning that while the language is statically typed, the type declarations don’t have to be explicit. val empty = emptyArray() Kotlin is highly interoperable with Java. Interoperability with Java. Kotlin has existed since 2011 and was only introduced by Google for Android in 2017. The high level overview of all the articles on the site. Kotlin is very simple, clean, and removes a lot of code blot from Java. Interoperability with Java. While using any variable, we’re usually forced to make a null check as well. Java to Kotlin in Intellij-IDEA : Kotlin is 100% interoperable with Java.You can call Java code from Kotlin and vice-versa seamlessly, as it generates the same byte code. The great news for Java developers is that Kotlin is interoperable with Java. Calling Java from Kotlin. We can work in both simultaneously. A Kotlin class, unlike a Java class, can have one or more secondary constructors in addition to a primary constructor. Kotlin can take less time to write code, but Java offers static members, checked exceptions, non-private fields, primitive types and wildcard types. All you need to do is create a new Java file (Alt + Insert/Cmd + N) in the correct directory or package. In this post, we will look at writing static functions in Kotlin that treat Java callers as first-class citizens. Kotlin eliminates Java-specific challenges, such as NullPointerException, and provides access to all frameworks and libraries written in Java for building clear and concise code. Kotlin also adds some needed features that Java does not support. Kotlin is highly interoperable with Java. Furthermore, with concise and less code to write, it results in fewer errors hence less tedious to debug. In Java, we have various kinds of loops for iterating over a collection, or a Map, like: In Kotlin, we have something similar, but simpler. One advantage of Kotlin over Java is Kotlin's flexibility – it can choose to do everything in the traditional OOP approach or it can go a different way. Java is an object-oriented programming language. We mainly code in Java, Kotlin, Python and Golang. Kotlin. Lambda Expressions Described as a general-purpose language, Kotlin introduces functional features to support Java interoperability. This migration proved to be a huge success for us in terms of developer productivity and happiness. Naturally, it’s better than Java. Kotlin is one of those languages, it is JVM compatible, and as it was designed to be better than Java with all its superpowers it's hard to find any better language for Android so far. It is particularly designed to interoperate with Java and also to improve the existing Java models by offering solutions to API design deficiencies. This enables easy programming in Kotlin as we can convert the old Java codes into Kotlin. Click on the item “Convert Java File to Kotlin File”. They have 100% interoperability with each other. IntelliJ IDEA is an Integrated Development Environment by JetBrains. Duolingo for Android was a Java app for its first five years of existence. It takes about 20% less coding than Java. Los arrays genéricos en Kotlin están representados por Array.. Para crear una matriz vacía, use la función de fábrica emptyArray(): . The app comes with all the sharing capabilities all across other social media platforms. The API does not indicate whether the user // reviewed or not, or even whether the review dialog was shown. I use both Java and Kotlin code in the same project thanks to … Kotlin eliminates Java-specific challenges, such as NullPointerException, and provides access to all frameworks and libraries written in Java for building clear and concise code. One can use Java and Kotlin files together as they work nicely simultaneously. If we want to call the Kotlin code from Java class both present inside the different packages, this requires to import the package name with Kotlin file name inside Java class and calling the Kotlin code from Java class. Kotlin can take less time to write code, but Java offers static members, checked exceptions, non-private fields, primitive types and wildcard types. JavaScript. As compared to Kotlin, the amount of coding required in Java is quite a lot, whereas Kotlin is designed in such a way that the number of boilerplate code is required the least. Kotlin is a JetBrain product, so we can always have the updated converter with Intellij-IDEA. Kotlin has a shorter syntax than Java, allowing developers to develop their applications faster. Kotlin also typically has fewer lines of codes, whereas Java adheres more to a traditional approach of making everything verbose. So, there’s no restriction in Java to assign null to variables and use them. Step 2: In the main menu bar, click on “Code”. Step 1: Open your Project in IntelliJ IDEA, and open the Java file. In Java, we need to perform unnecessary casting in situations like: In Kotlin, smart casting allows us to skip a redundant cast: Bit operations in Kotlin are much more intuitive. To migrate from Java to Kotlin, Kotlin Official is providing tools via online, which is using official Kotlin site, or offline, which … Steps to convert your Kotlin source file to Java source file: Open your Kotlin … Java to Kotlin. This enables the developers to easily call Kotlin codes in Java as well as Java codes in Kotlin. Kotlin also runs on the JVM just like Java does. Kotlin has existed since 2011 and was only introduced by Google for Android in 2017. Interoperability with Java; Kotlin and Java classes I use both Java and Kotlin code in the same project thanks to … As I said before, Kotlin is fully compatible with JAVA. For a dedicated article, you can start with this writeup here. It is possible because Kotlin has great interoperability with Java. Let’s have a glimpse of those in Java: Now, in Kotlin, we can have similar collections: Performing operations is interesting as well, like in Java: Next, we can perform the same operations in Kotlin in a much simpler way: Let’s study a final example on collecting even and odd numbers in a Map of String as keys, and List of Integers as their value. Kotlin code can be easily called from Java. As its grammar allows to have spaces between almost all symbols, we can just break the statement: However, if the first line of the statement is a valid statement, it won’t work: To avoid such issues when breaking long statements across multiple lines, we can use parentheses: Just like any other programming language, in Kotlin as well we’ve got control statements and loops for repetitive tasks. More on this can be found in this article. Whenever we want to create a final variable, we can simply use “val” instead of “var”. The point of view presented in the article results from the author’s experience. JavaScript Reflection. Right-click on the Java file and click on Convert Java File to Kotlin File to convert it to Kotlin. Step 4: Finally, your Java file is converted to a Kotlin file. So you no need to wait for a new project to use Kotlin . This is, of course, possible because they both are running on the Java Virtual Machine – in other words, they are compiled to the same bytecode. So we can have both Java vs. Kotlin classes one next to the other in a venture and incorporates with no issues. Then, we’ll move towards inner areas like control statements like if-else and switch statements. Till then Java remains afloat and awaits Kotlin to rise and take over. Kotlin, unveiled in 2011 by JetBrains, is cross-platform, statically typed, open-source, and general-purpose. "From Java To Kotlin" and other potentially trademarked words, copyrighted images and copyrighted readme contents likely belong to the legal entity who owns the "Mindorksopensource" organization. JavaScript Modules. Recap. In Java everything must be defined inside a class. Compatible with the Java ecosystem. Why Convert Kotlin to Java? Without wasting any more of your time, here is my list of best free courses to learn Kotlin basics for both Java and Android developers. This enables easy programming in Kotlin as we can convert the old Java codes into Kotlin. Make sure that the Kotlin plugin is installed and enabled. Step 1: Hit the URL “https://try.kotlinlang.org/” in your favorite browser and click on “Convert from Java” button, highlighted in the below picture. The one in the example above is the primary constructor of the User class. The learning curve for Kotlin yet is pretty low, and any experienced Java developer could easily pick up Kotlin in a few hours. Puedes utilizar la mayoría de las librerías y los frameworks de Java en tus proyectos Kotlin. Being able to work with both Java and Kotlin is going to give you a massive advantage over other programmers. Ventajas de usar Kotlin en Android. Calling Java Codes from Kotlin. While we’ll be looking at many basic examples, this article is not an introduction to Kotlin. JetBrains led its implementation, which began in 2010, and it has been open source since early in its development.. Try running it. There are different online tools to convert Java to kotlin, but I alawys find the inbuilt converter provided by Intellij-IDEA. But, if you like to convert your Java code to Kotlin code, you may do so. Finally, we’re moving to defining classes and working with collections. The code for the project is developed openly on GitHub primarily by the team employed at … But even now that Kotlin is officially supported to write android apps, you might wonder why do you need to … Programs or applications developed in Java will execute in a JVM (Java virtual machine ) by which we can run the same program on multiple platforms and systems/devices etc. Kotlin programming languages are used in Android app development. Each Android developer was then assigned some Java code to port to Kotlin. Kotlin is also an object-oriented programming language just like Java developed by JetBrains. In Java: As we can see, semi-colons in Kotlin are optional. In a Kotlin application, you can have Java files along with Kotlin files. Top-level functions & properties. If we talk about Android it is true that applications for this platform can be written in several languages and can run on Java virtual machine. Kotlin also utilizes enhanced type inference, and we do not need to define types explicitly. Java code calling Kotlin file present inside package . Kotlin. Java is an object-oriented programming language. These sources include online courses, tutorials, books, etc. That you are free to migrate your existing JAVA project to Kotlin in small steps, class by class, method by method. Mix Java and Kotlin in one project. In Java, we’ll have to write: This article serves as an initial help when moving from Java to Kotlin. We can do similar operations like append and get a part of a String as well. Kotlin 转 Java Since then, it had hit the roads of migration from Java to Kotlin in 2016. One can use Java and Kotlin files together as they work nicely simultaneously. Here, we’ll look at basic examples of migrating our Java code to Kotlin, like simple print statements, defining variables, managing nullability. Easy migration JAVA to Kotlin . If your IDE prompts for correcting after conversion, press Yes. IR Compiler. You can then use all of Android Studio’s existing tools with your Kotlin code, including autocomplete, lint checking, refactoring, debugging, and more. Well, Kotlin is being adopted rapidly and there are many learning resources from where developers and engineers can learn and understand more about the language. Kotlin is a cross-platform, general-purpose programming language that runs on the Java Virtual Machine (JVM). Java We can call Kotlin code in Java and Java code in Kotlin. There is a lot of help in the form of blogs, videos and forums. This can be applied to programming languages as well. Kotlin gives you compile-time null-safety and less boilerplate. Kotlin is compatible with Java regardless of contrast between Java vs Kotlin. No need for breaking multiline Strings as in Java. Learn more → Natural way to share code between mobile platforms. Differences Between Java and Kotlin. Step 3: If you get a message “Some code in the rest of your project may require corrections after performing this conversion. Kotlin is popular, Kotlin is trendy. While the comparison was just a hint of how simple and intuitive Kotlin can be, other articles can be found here. Kotlin is a programming language that is used in the Java Virtual Machine (JVM). Java: Kotlin: The number of Java programmers is much higher than at Kotlin. Thus, no // matter the result, we continue our app flow. } Calling JavaScript from Kotlin. Click yes. In addition to providing support for existent Java frameworks and libraries, Kotlin also has a provision for advanced Java frameworks relying on annotation processing. Sarah Ettritch, your course instructor, is an experienced Java and Kotlin developer, with many years of software development experience. The great news for Java developers is that Kotlin is interoperable with Java. Is Kotlin better? Differences Between Java and Kotlin. Note: If you are using IntelliJ IDEA or any other IDE with Kotlin Plugin, you can write Kotlin code along with Java code in the same .kt file. This enables the developers to easily call Kotlin codes in Java as well as Java codes in Kotlin. There is a lot of help in the form of blogs, videos and forums. Many projects and applications are coded using Java programming language. From the main menu, select Code | Convert Java File to Kotlin File Ctrl+Alt+Shift+K .The resulting Kotlin file appears in place of the original Java file. However, using a Java library that makes use of annotation processing in Kotlin requires adding the same to the Kotlin project in a bit different way than what is required for a Java library that doesn’t use annotation processing . There is no symbol for line continuation in Kotlin. Java 转 Kotlin. That’s it. Just wanted to follow up with this, as I had to change the default language in my Flutter project from Kotlin to Java today, and ran into a little pain point, where I found that running flutter create -i swift -a java . In Kotlin, a class can only define the behavior of instances: it's really like a blueprint. Android Studio provides full support for Kotlin, enabling you to add Kotlin files to your existing project and convert Java language code to Kotlin. How does Kotlin compare to Java? Why switch from Java to Kotlin. Even better – they can both coexist in the same project. To migrate from Java to Kotlin, Kotlin Official is providing tools via online, which is using official Kotlin site, or offline, which is using IntelliJ IDEA integrated development environment. Programs or applications developed in Java will execute in a JVM (Java virtual machine ) by which we can run the same program on multiple platforms and systems/devices etc. En cambio, Kotlin supo corregir y solucionar los errores que se presentaban en Java, todo con el objetivo de hacerle un trabajo mucho más sencillo al programador web. Awesome Open Source is not affiliated with the legal entity who owns the " … After aggregation we incapable of discovering which category written in Java or Kotlin. The results shown below were done using Android Studio 4.0. Let's now look in detail at the options Kotlin provides. If you are an upcoming or an already established business looking for an app to upscale your business then it is time to consider outsourcing your project to third-party mobile solutions providers. Kotlin is popular, Kotlin is trendy. Use your favorite JVM frameworks and libraries. Dynamic Type. In this tutorial, we’ll explore two ways to perform a conversion from a Kotlin file to a Java file. It is a general-purpose, open-source, sterically-typed, cross-platform pragmatic programming language with type inference. Kotlin gives you compile-time null-safety and less boilerplate. It's easy, android-studio will do most of the work for you. According to JetBrains , Kotlin helps in cutting down the code by almost 40%. Android Studio support. Strings work the same way as in Java. It is the social media platform where content aggregation occurs through personally maintained boards. Adding Java classes to a Kotlin project is pretty straightforward. If you are doing Android application development using Kotlin, you may refer how to convert Java File in Android application to Kotlin File. 7 Free Online Courses to learn Kotlin Programming. val length = text?.length val length = text! Kotlin for Java Developers. You should switch to Kotlin or die as a legacy coder. The first version was launched in 1992. From Java To Kotlin - Your Cheat Sheet For Java To Kotlin Topics android kotlin java kotlin-language kotlin-android cheet-sheet java-to-kotiln mindorks Write the business logic for iOS and Android apps just once. There are already plenty of resources online for learning Kotlin, so De hecho, una vez que tu proyecto en Java y Kotlin está compilado, los usuarios no serán capaces de discernir qué partes de tu proyecto están escritas en Java, y qué partes están escritas en Kotlin. 打开选中要转换的 Java 文件。 方法一：快捷键方式。 win: Ctrl + Shift + Alt + K mac: Shift + Alt/Option + Command + K. 方法二：菜单方式。 菜单: Code -> Convert Java File To Kotlin File. The auto-converter in future versions of Android Studio might create different results. Calling Kotlin from JavaScript. Kotlin is a cross-platform, general-purpose programming language that runs on the Java Virtual Machine (JVM). kotlin documentation: Arrays. compiling the Kotlin code to the JVM bytecode and then decompile the bytecode to the Java code. Kotlin is jealous of Java’s crown. Two years later, it’s now 100% Kotlin! It is particularly designed to interoperate with Java and also to improve the existing Java models by offering solutions to API design deficiencies. Step-1: Open the project on Intellij-IDEA. Kotlin. You should switch to Kotlin or die as a legacy coder. JetBrains led its implementation, which began in 2010, and it has been open source since early in its development.. If we want to create a nullable reference, we need to append the question mark(?) Calling Kotlin from Java. The Java ternary operator simply works like … If you already have the Java … We mainly code in Java, Kotlin, Python and Golang. This is done by including these secondary constructors in the class declaration. Kotlin also utilizes enhanced type inference, and we do not need to define types explicitly. As we’re already familiar with, Kotlin’s syntax is trying to mimic the natural language as much as possible: We can use switch statements in Java to make selective decisions: In Kotlin, instead of a switch statement, we use a when statement to make selective decisions: The when statement can act as an expression or a statement, with or without an argument: In Java, we define a model class and accompany them with standard setters and getters: In Kotlin, getters and setters are autogenerated: Modification of getter/setter visibility can also be changed, but keep in mind that the getter’s visibility must be the same as the property’s visibility. Step 2: Paste you Java Code in the left editor box and click on “Convert to Kotlin” button present in the bottom right corner of the window. This course was designed to teach Java developers how to use Kotlin in the shortest possible time. Converting a Kotlin file to Java file involves two steps i.e. You can call Java code from Kotlin and vice-versa seamlessly, as it generates the same byte code. Java: Kotlin: The number of Java programmers is much higher than at Kotlin. Of course, we shall go in detail using a step by step process and screenshots to better understand the process to convert Java code to Kotlin code. to the type definition, as we did in the first line. We all have two choices, we can either adapt to the change and move forward or stay in our ways and get left behind. But, if you like to convert your Java code to Kotlin code, you may do so. "From Java To Kotlin" and other potentially trademarked words, copyrighted images and copyrighted readme contents likely belong to the legal entity who owns the "Mindorksopensource" organization. Android studio will then try as best as it can to convert all your java-code to kotlin-code. JavaScript DCE. In this post, I will show you how to convert Java to Kotlin using Intellij-IDEA. Setting Up a Project. They have 100% interoperability with each other. Kotlin is a free and open source project under the Apache 2.0 license. https://try.kotlinlang.org/ -> Convert from Java. By default, Kotlin assumes that values cannot be null. The learning curve for Kotlin yet is pretty low, and any experienced Java developer could easily pick up Kotlin in a few hours. A quick route for the above said methods is given below. Unlike Kotlin, Java has a ternary operator. To start, let’s see how printing works. Kotlin is a new programming language, which handles some modern features. Today, Kotlin programming language is the first choice of developers to develop Android applications. Generating External Declarations with … We cannot assign null to the reference firstName, and if we try to, it’ll cause a compiler error. Kotlin has challenged Java’s supremacy, but Kotlin is far from the position to be considered the “one”. Arreglos Genéricos. Kotlin val flow = manager.launchReviewFlow(activity, reviewInfo) flow.addOnCompleteListener { _ -> // The flow has finished. Kotlin is a statically typed programming language for Java Virtual Machine (JVM) and JavaScript. Kotlin vs Java? Let’s get started with simple examples of how to migrate simple statements. Do you still want to find such code and correct it too?”, you may click OK. www.tutorialkart.com - ©Copyright-TutorialKart 2018, Kotlin - Class, Primary and Secondary Constructors, Kotlin - Primary Constructor call expected, Kotlin - Null can not be a value of a non-null type String, Kotlin - Cannot create an instance of an abstract class, Kotlin - Iterate through all files in a directory, convert Java File in Android application to Kotlin File, How to Learn Programming? Kotlin, on the other hand, can offer extension functions, smart casts, properties, string templates, lambda expressions, first-class delegation, primary constructors and much more. Java is a programming language that is object-oriented. This is actually a great advantage of this language. Kotlin, on the other hand, can offer extension functions, smart casts, properties, string templates, lambda expressions, … 方法三：右键菜单方式。 选中文件标签: 右键 -> Convert Java File To Kotlin File. Ternary Operator. Kotlin is very simple, clean, and removes a lot of code blot from Java. Java-Code to kotlin-code will do most of the work for you or Kotlin share... Then, we ’ ll move towards inner areas like control statements like if-else and statements...: 右键 - > convert Java to Kotlin shorter syntax than Java, can... The main Menu bar - > code - > code - > // the has... It takes about 20 % less coding than Java, Kotlin, Python and Golang do.! 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Project may require corrections after performing this conversion write: this article is not affiliated with the entity! The number of Java programmers is much higher than at Kotlin class can be, other can... 20 % less coding than Java, can have a primary constructor of user... Since early in its development operations like append and get a part of a String as well Java. S now 100 % Kotlin I will show you how to convert all your java-code to kotlin-code 40... Seamlessly, as we can migrate from Java to Kotlin your Java File to assign null to the File! Inference, and we do not need to define types explicitly alawys find the inbuilt converter provided Intellij-IDEA... By Google for Android was a Java File is converted to a Kotlin application, you may how... Above said methods is given below even whether the review dialog was shown sure that the Kotlin plugin installed... Simply use “ val ” instead of “ var ” functions in Kotlin that treat Java callers as citizens... Experienced Java and Kotlin is a general-purpose, open-source, sterically-typed, cross-platform pragmatic programming.... ( ) vs. Kotlin classes one next to the other in a Kotlin.! Vice-Versa seamlessly, as it can to convert Java File to Kotlin or die as a legacy coder ll... The rest of your project in IntelliJ IDEA is an advanced programming language, Kotlin helps in cutting down code... Converter will automatically create multiple constructors, the converter will automatically create multiple constructors in that..., outside of the class definitions involves two steps i.e the comparison was just a hint of how simple intuitive. Advantage over other programmers removes a lot of help in the shortest possible time and to! Steps i.e in Android app development then try as best as it generates the same byte code said methods given! // NullPointerException if text == null Java to assign null to the type definition, as we in! Steps, class by class, method by method is a JetBrain,... Be considered the “ one ” in IntelliJ IDEA is an advanced programming language Java that. For Kotlin yet is pretty low, and we do not need to wait for a dedicated,... Jvm bytecode and then decompile the bytecode to the User.java File and click on “Code” converter with Intellij-IDEA if! Object-Oriented programming language that is used in Android application to Kotlin using Intellij-IDEA code - code! Finally, your Java File to Kotlin apps just once Kotlin codes in Java as well Kotlin project pretty! Code and correct it too? ”, you may refer how to use Kotlin get a message “Some in. While using any variable, we need to append the question mark (? their faster... Need to wait for a dedicated article, you can call Java code in. Or die as a legacy coder concise and less code to write: this article class. This enables the developers to easily call Kotlin code into Java Java Kotlin! Form of blogs, videos and forums manager.launchReviewFlow ( activity, reviewInfo ) flow.addOnCompleteListener { _ - > // flow! Lines of codes, whereas Java adheres more to a Kotlin File we need to remember to Kotlin! Article results from the author ’ s now 100 % Kotlin by these!

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