Coding DOJO to play with Java 8 Streams API.

• ToUpperCase(map): convert elements of a collection to upper case

• FilterCollection(filter): filter collection so that only elements with less than 4 characters are returned

• FlatCollection(flatMap): flatten multidimensional collection

• OldestPerson(max, comparator): get oldest person from the collection

• Sum(reduce): sum all elements of a collection

• Kids(filter, map): get names of all kids (age under 18)

• PeopleStats(summaryStatistics): get people statistics: average age, count, max age, min age and sum of all ages

• Partitioning(partitioningBy): partition adults and kids

• Grouping(groupingBy): group people by house

• Joining(joining): join people by names