Fix the following code:

Question

Considering the following class :

```javascript
'use strict';

const fs = require('fs');

class FileManager {
  constructor(filename) {
    this.fileName = filename;
    this.fileContent = null;
  }
  open() {
    fs.readFile(this.fileName, function(err, data) {
      if (err) { throw err; }
      this.fileContent = data;
    })
  }
  getText() {
    return String(this.fileContent);
  }
}

let foobar = new FileManager('foobar.txt');
foobar.open();
console.log( foobar.getText() );
```

What are/is the problem(s) with this code?
*(We assume that the file to read exists and that it contains text)*

Accepted Answer

Assuming the code works, the `console.log` could never display data from `foobar.txt`.

Accepted Answer

The `this` context of the callback function is not the same as that of the object.

Answer

You cannot directly use `String` to convert to text. You would have to go through the `.toString()` method

Answer

It is not possible to use asynchronous functions in a class.

Question from the Node.js test

Fix the following code: