Kotlin

Various aspects of Kotlin distinguish it from traditional Java, while much of the core functionality remains the same across the board – items distinguishing the use of Kotlin include a relaxed requirement that functions be class members, as well as support for higher-order functions, anonymous functions and other types of constructs.

Experts contend that Kotlin preserves most of the object-oriented nature of Java, for example, with simple inference from a named superclass. There are also additional safeguards against null pointer references and problems with null values.