FreeBuilder 1.9: Map and mutate methods for Java 8

[Chris Purcell]

Hey folks!

I'm stoked to announce a feature I've been wanting to use for ages: @FreeBuilder now supports Java 8 lambda methods with new map/mutate methods, allowing a more fluent approach to updating properties on a Builder. For example, to increment a property:

Person olderPerson = new Person.Builder()

    .mergeFrom(person)

    .mapAge(age -> age + 1)

    .build();

To delete part of a list:

personBuilder.mutateDescendants(d -> d.subList(3, 5).clear());

To update part of a property with its own builder:

projectBuilder.mutateOwner(b -> b

    .setName("Phil")

    .setDepartment("HR"));

Happy coding!

Chris