JavaScript Classes Context and "this" keyword

[smus]

I am not familiar with classes, so I need a solution, or, at least, a clue, please!                    

This code causes the error: TypeError: Cannot read property 'vendor' of undefined

When I am trying to check its correctness, the interpreter also informs that the context is not bound to the 'getInfo' method. 

How can we correct classes in order to avoid the error? 

class Transport {
  constructor(type, price, vendor, model) {
    this.type = type;
    this.price = price;
    this.vendor = vendor;
    this.model = model;
  }

  getInfo() {
    return `${this.vendor}, ${this.model}`;
  }

  getPrice() {
    return this.price + '$';
  }
}

class Car extends Transport {
  constructor(vendor, model, doorsCount, price) {
    super('car', price, vendor, model);
    this.doorsCount = doorsCount;
  }

  getDoorsCount() {
    return `Number of doors: ${this.doorsCount}`;
  }
}

class Bike extends Transport {
  constructor(vendor, model, maxSpeed, price) {
    super('bike', price, vendor, model);
    this.maxSpeed = maxSpeed;
  }

  getMaxSpeed() {
    return `Max speed: ${this.maxSpeed} kmh`;
  }
}

 

Edited June 20, 2021 by smus