In multiplatform projects, files with top-level declarations in platform-specific source sets should have a suffix associated with the name of the source set. Therefore, you should avoid using meaningless words such as Util in file names. The name of the file should describe what the code in the file does. Use an upper camel case with an uppercase first letter (also known as Pascal case), for example, ProcessDeclarations.kt. If a file contains multiple classes, or only top-level declarations, choose a name describing what the file contains, and name the file accordingly. It applies to all types of classes and interfaces. If a Kotlin file contains a single class or interface (potentially with related top-level declarations), its name should be the same as the name of the class, with the. On JVM: In projects where Kotlin is used together with Java, Kotlin source files should reside in the same source root as the Java source files, and follow the same directory structure: each file should be stored in the directory corresponding to each package statement. For example, if all the code in the project is in the package and its subpackages, files with the package should be placed directly under the source root, and files in .socket should be in the network/socket subdirectory of the source root. In pure Kotlin projects, the recommended directory structure follows the package structure with the common root package omitted. Source code organization Directory structure Additional inspections that verify other issues described in the style guide (such as naming conventions) are enabled by default. Switch on Incorrect formatting inspection. Go to Settings/Preferences | Editor | Inspections | General. Verify that your code follows the style guide

Go to Settings/Preferences | Editor | Code Style | Kotlin. You can configure them to automatically format your code in consistence with the given code style. Two most popular IDEs for Kotlin - IntelliJ IDEA and Android Studio provide powerful support for code styling. Here we provide guidelines on the code style and code organization for projects that use Kotlin. Commonly known and easy-to-follow coding conventions are vital for any programming language.

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