Document type sem método factory

main.dart

enum DocumentStatus{
  pending,
  approved,
  rejected
}

class Document {
    String title;
    String content;
    DocumentStatus status;

    Document(this.title, this.content, [this.status = DocumentStatus.pending]);
}

// SEM O USO DO FACTORY
void main() {
  final document = Document('title', 'content');
  print(document.status); // DocumentStatus.pending

  final approvedDocument = Document(document.title, document.content, DocumentStatus.approved);
  print(approvedDocument.status); // DocumentStatus.approved

  final rejectedDocument = Document(document.title, document.content, DocumentStatus.rejected);
  print(rejectedDocument.status); // DocumentStatus.rejected

  final pendingDocument = Document(document.title, document.content, DocumentStatus.pending);
  print(pendingDocument.status); // DocumentStatus.pending
}