class Vehicle {
  #speed = 0;

  constructor(type, maxSpeed) {
    this.type = type;
    this.maxSpeed = maxSpeed;
  }

  accelerate(amount) {
    this.#speed = Math.min(this.#speed + amount, this.maxSpeed);
    return this;
  }

  getStatus() {
    return `${this.type} going ${this.#speed}/${this.maxSpeed} km/h`;
  }
}

class ElectricVehicle extends Vehicle {
  #battery;

  constructor(type, maxSpeed, battery) {
    super(type, maxSpeed);
    this.#battery = battery;
  }

  accelerate(amount) {
    this.#battery -= amount * 0.5;
    return super.accelerate(amount);
  }

  getStatus() {
    return `${super.getStatus()} | Battery: ${this.#battery}%`;
  }
}

const ev = new ElectricVehicle("Tesla", 250, 100);
ev.accelerate(80).accelerate(200);
console.log(ev.getStatus());
console.log(ev instanceof Vehicle);
console.log(ev.constructor === ElectricVehicle);