What's the output?

Question

```javascript
class Counter {
  #number = 10

increment() {
    this.#number++
  }

getNum() {
    return this.#number
  }
}

const counter = new Counter()
counter.increment()

console.log(counter.#number)
```

Accepted Answer

In ES2020, we can add private variables in classes by using the `#`. We cannot access these variables outside of the class. When we try to log `counter.#number`, a SyntaxError gets thrown: we cannot access it outside the `Counter` class!

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