Builder.js

class car
{
    constructor()
    {
        this.autoPilot = false;
        this.parktronic = false;
        this.signaling = false;
    }
}

class CarBuilder
{
    constructor()
    {
        this.car = new car();
    }
    
    addAutoPilot(autoPilot)
    {
        this.car.autoPilot = autoPilot;
        return this;
    }
    
    addParktronic(parktronic)
    {
        this.car.parktronic = parktronic;
        return this;
    }
    
    addSignaling(signaling)
    {
        this.car.signaling = signaling;
        return this;
    }
    
    updateEngine(engine)
    {
        this.car.engine = engine;
        return this;
    }
    
    build()
    {
        return this.car;
    }
    
}

const myCar = new CarBuilder()
                    .addAutoPilot(true)
                    .addParktronic(true)
                    .updateEngine('V8')
                    .build();

console.log(myCar);