OOP

// The car interface
inteface Vehicle
- (void)run

// class Car conforms `Vehicle` interface
class Car conforms Vehicle {
  // override run method
  - (void)run() {
    console.log("Car is running");
  }
}

class Human {
  - (void)drive:(car :Vehicle) {
    car.run();
  }
}

var khang = new Human();
var hondaCivic = new Car();
khang.drive(hondaCivic);