Scala

Scala is a program that combines object-oriented and functional programming in the same language. Scala's static types help avoid bugs in complex applications, and the JVM and JavaScript runtime environments allow you to create high-performance systems with access to a huge number of libraries.

Scala features:

• The ability to combine Scala and Java without any complexity. Java code can reference Scala classes and objects, and vice versa.
• In most cases, there is no need to manually specify the type of variables.
• Support for asynchronous programming.
• Every function is a value and every construction returns a value.

As well as many other things.

It's worth adding that the language comes with comprehensive documentation that will help even beginners in mastering all the features of Scala and using them effectively.

Note that you will need Java 1.8 or later to run Scala.