Union de fléchettes
final a = {1,2,3};
final b = {2,3,4};
final c = a.union(b);
// {1,2,3,4}
just-saved-you-a-stackoverflow-visit
final a = {1,2,3};
final b = {2,3,4};
final c = a.union(b);
// {1,2,3,4}