Class Fundamental in Dart

main.dart

//use classes to define new type
//we are used to int, String, bool, List, Map, Set, Function
//classes - blueprint for objects
//object - container that holds some data (functionality in manipulate the data)
void main() {
  var myHouse = House(nuOfWindows: 8, nuOfDoors: 4, typesOfWalls: 'Brick', typesOfRoof:'Tile');
  // myHouse.nrOfDoors = 10;
  //
  // print(myHouse.nrOfDoors);
  myHouse.printHouses();
}
//classess are created outside a main method

class House {
  int nrOfWindows = 0;
  int nrOfDoors = 0;
  String typeOfWalls = '';
  String typeOfRoof = '';

  //create constructor
  House(
      {required int nuOfWindows,
      required int nuOfDoors,
      required String typesOfWalls,
      required String typesOfRoof}) :
    this.nrOfWindows = nuOfWindows,
    this.nrOfDoors = nuOfDoors,
    this.typeOfWalls = typesOfWalls,
    this.typeOfRoof = typesOfRoof;
  
  //This is a method or function
  void printHouses() {
    print('number of windows: ${this.nrOfWindows}');
    print('number of doors : ${this.nrOfDoors}');
    print('type of walls: ${this.typeOfWalls}');
    print('type of roof: ${this.typeOfRoof}');
  }
}