I have an object which basically consists of some of the names of cars. I just want to **delete the key of that object** based on user input.

For instance:

```js
let cars = {
  car1: 'BMW',
  car2: 'Lambo',
  car3: 'Mercedes'
};

const deleteCar = (car) => {
  delete cars.car;
}

deleteCar('car1');
console.log(cars);
```

As you can see, it doesn't actually delete the key from the object. How can I do this?