Functional computation on a collection

FunctionalCollectionComputation.java

List<String> names = Arrays.asList("Alice", "Bob", "Charlie", "Dave");
names
   .mapped(e -> { return e.length(); })
   .asIterable() // returns an Iterable of BiValue elements
                 // an element's key is the person's name, its value is the string length
   .filter(e -> e.getValue() >= 4)
   .sorted((a, b) -> a.getValue() - b.getValue())
   .forEach(e -> { System.out.println(e.getKey() + '\t' + e.getValue()); });

Updated version of this code using the recent APIs:

        List<String> names = Arrays.asList("Alice", "Bob", "Charlie", "Dave", "Ed");
        names.stream()
                .mapped(name -> name.length())
                .filterValues((length) -> length >= 4)
                .sorted((name1, name2) -> name1.length() - name2.length())
                .forEach((name, length) -> System.out.println(name + '\t' + length));