Rust like Default Trait for Dart?

[18601673727]

Given following rust code:

#[derive(Default)]
struct MyStructure {
    id: usize,
    name: String,
}

So that MyStructure.id would be 0 and MyStructure.name would be "" by default.
Wonder if there was something equivalent to this approach/suger in Dart?

[mnordine]

This seems to be achievable with the upcoming macros language feature:

@default
class MyClass {
  int id;
  String name;
}

could desugar to:

class MyClass {
  int id = 0;
  String name = '';
}

[18601673727]

@mnordine Thanks a lot!

[Levi-Lesches]

Note that you can just write the regular class with their defaults today, as @mnordine said. You can also put the defaults in the constructor for slightly more control.

class MyClass {
  int? id;
  String? name;

  MyClass.allNull({this.id, this.name});  // leaves fields null if not given a value

  MyClass.nonNull({this.id = 0, this.name = "");  // will give every field a default
}

Does that answer your request?