object-functional language extension for Java

 Vavr (formerly called Javaslang) is an object-functional language
 extension for Java 8+.
 .
 Vavr aims to reduce the lines of code and increase code quality.
 It provides persistent collections, functional abstractions for error
 handling, concurrent programming, pattern matching and much more.
 .
 Vavr fuses the power of object-oriented programming with the elegance
 and robustness of functional programming. Its feature-rich, persistent
 collection library smoothly integrates with Java's standard collections.
 .
 Vavr does not depend on any libraries (other than the JVM).