mapToSet<T> method Null safety

Set<T> mapToSet<T>(
  1. Set<T> destination,
  2. Transform<E, T> f
)

Transforms elements to objects of type T with the transformer f, and appends the result to the given destination.

Implementation

Set<T> mapToSet<T>(Set<T> destination, Transform<E, T> f) {
  this?.map(f).forEach((e) => destination.add(e));
  return destination;
}