mirrored_repositories/mobile_lab1
String foo = 'a string';
String bar; //Unassigned objects are null by default

//Substitute an operator that makes 'a string' be assigned to baz.
String baz = foo ?? bar;

void main() {
  // Substitute an operator that makes 'a string' be assigned to bar.
  bar ??= 'a string';
  print(bar);
}
