Dart TIL

main.dart

void main() {
  // Typed variables raise type errors
  var typed1 = 1;
  // typed1 = '2';
  int typed2;
  // typed2 = '2';
  
  // Dynamic types don't raise type errors
  var a;
  a = 1;
  print(a);
  a = 'we';
  print(a);
  
  // Underscores are valid variable names
  var _ = 'underscoer';
  print(_);
  
  // Final variables are still copied by address and not by value
  final List<int> list = [1, 2];
  print(list);
  list.add(3);
  print(list);
  final List<int> list2 = list;
  list2.add(4);
  print(list);
  
  // You can use `..` to return the object on which the method is executed (e.g. if method returns `void`)
  [].addAll([1, 2]); // => void
  print([]..addAll([1, 2])); // => [1, 2]
  
  // Null aware assignment
  String equalsIfNotNull;
  equalsIfNotNull ??= 'works';
  print(equalsIfNotNull); // => works
}