adelatorrefoss

// Examples with Lists and Sets
// For small numbers of items, it's common in Groovy to use a list for set processing, and only convert it to a set when necessary, eg, for output.

// Though the uniqueness of set items is useful for some processing, for example, if we want to separate the unique and duplicating items in a list:

list=[1,2,7,2,2,4,7,11,5,2,5]
def uniques= [] as Set, dups= [] as Set
list.each{ uniques.add(it) || dups.add(it) }
uniques.removeAll(dups)
assert uniques == [1,4,11] as Set && dups == [2,5,7] as Set

adelatorrefoss

interface Repository<T> {
   T save(T t)
}

interface IntegerRepository {
   Integer findByIntegers(String name)
}

abstract class InMemoryRepository<A> implements Repository<A> { 
    A save(A a) {