dart map tuple code example
Example: dartlang tuple
const t = const Tuple2<String, int>('a', 10);
print(t.item1); // prints 'a'
print(t.item2); // prints '10'
const t = const Tuple2<String, int>('a', 10);
print(t.item1); // prints 'a'
print(t.item2); // prints '10'