⭐️ VAVR 0.11.0 RELEASED ⭐️

The last minor release before 1.0.0

Release Details

A new powerful collection library saves us from source.stream().really("?").collect(sink()) pipelines.

List<String> names = persons
 .filter(p -> p.age > 12)
 .map(Person::getName);

The functional For is an expression that yields a value. The result is a lazy evaluated collection of elements.

Iterator<String> iterator =
 For(persons.filter(Person::hasAddress), p ->
 For(p.addresses).yield(a ->
 p.name + "," + a.street
 )
 );

Vavr and Java are fully interoperable.

java.util.List<Integer> result =
 iterator.map(String::length).asJava();

Structural pattern matching is an easy way to decompose values. The result is ... a value!

Number num = Match(personOption).of(
 Case($Some($Person($())), person -> 1.0d),
 Case($None(), 0)
);

The Try monad represents the result state of a computation which may be a Success or a Failure.

R result = Try(() -> mightFail())
 .recover(x -> ...)
 .getOrElse(defaultValue);

Java's Optional is not Serializable. We use Vavr's Option for remote operations. Check out our JSON module!

class Person implements Serializable {
 final Option<String> title;
 final String name;
 ...
}