How can I clone an Object (deep copy) in Dart?

Question

Is there a Language supported way make a full (deep) copy of an Object in Dart?

Secondary only; are there multiple ways of doing this, and what are the differences?<

Answer 1

Unfortunately no language support. What I did is to create an abstract class called copyable which I can implement in the classes I want to be able to copy:

abstract class Copyable {
  T copy();
  T copyWith();
}

I can then use this as follows, e.g. for a Location object:

@override
Location copy() {
  return Location(
      longitude: this.longitude,
      latitude: this.latitude,
      timestamp: this.timestamp,
      country: this.country,
      locality: this.locality,
      postalCode: this.postalCode,
      name: this.name,
      isoCountryCode: this.isoCountryCode,
      bearing: this.bearing);
}

@override
Location copyWith({
    String country,
    String locality,
    String name
  }) {
  return Location(
      country: country,
      locality: locality,
      name: name,
      longitude: this.longitude,
      latitude: this.latitude,
      timestamp: this.timestamp,
      postalCode: this.postalCode,
      isoCountryCode: this.isoCountryCode,
      bearing: this.bearing);
}