Sample code for "Top 10 Map/Object utility methods you should know (Dart) 🎯" (Complete solution)

top_10_map_utilties.dart

void main() {
  var user = {
    "firstName": "Tom",
    "age": 25,
  };
  
  // 1. addAll()
  user.addAll({
    "lastName": "Smith",
    "age": 26,
  });
  
  print(user);
  
  print('\n-----\n');
  
  // 2. containsKey()
  print(user.containsKey("age"));
  print(user.containsKey("accessToken"));
  
  print('\n-----\n');
	
  // 3. containsValue()
  print(user.containsValue("Smith"));
  print(user.containsValue(40));
  
  print('\n-----\n');
        
  // 4. forEach()
  user.forEach((key, value) => print('Key: $key, Value: $value'));
  
  print('\n-----\n');
  
  // 5. putIfAbsent()
  user.putIfAbsent("accessToken", () => "abf329jklr90rnlk2...");
  print(user);
  
  print('\n-----\n');
  
  // 6. remove()
  var removedToken = user.remove("accessToken");
  print(removedToken);
  
  print('\n-----\n');
  
  // 7. removeWhere()
  user.removeWhere((key, value) => key == "lastName");
  print(user);
  
  print('\n-----\n');
  
  // 8. clear()
  user.clear();
  print(user);
  
  print('\n-----\n');
  
  // 9. update()
  user["age"] = 25;
  user.update("age", (dynamic val) => ++val);
  
  // 10. Map.from()
  var userCopy = Map.from(user);
  print(userCopy);
}