Coding Conventions

Coding Conventions

This page contains the current coding style for the Kotlin language.

Naming Style

If in doubt default to the Java Coding Conventions such as:

• use of camelCase for names (and avoid underscore in names)
• types start with upper case
• methods and properties start with lower case
• use 4 space indentation
• public functions should have documentation such that it appears in Kotlin Doc

Colon

There is a space before colon where colon separates type and supertype and there's no space where colon separates instance and type:

interface Foo<out T : Any> : Bar {
    fun foo(a: Int): T
}

Lambdas

In lambda expressions, spaces should be used around the curly braces, as well as around the arrow which separates the parameters from the body. Whenever possible, a lambda sho