The Scala programming language has just been upgraded to version 2.13, which comes with a range of improvements in many areas such as collections, libraries, language, and compiler.
Scala has redesigned standard library collections to bring simplicity, performance and security to the language. The futures contracts have been redesigned internally.
The scaladocusecase marker was neglected and Equiv was also obsolete. And the following modules are no longer included in scala-xml, scala-parser-combinators, scala-swing, and the various and old styles and categories are removed in the standard library completely.
Although this latest version of Scala focuses on standard library improvements, several changes have been made to the language aspect. At the translator level, the Scala compiler is now 5 to 10% faster than earlier versions. Finally, operations on clusters and tables are now more improved.
Source : Scala