Usa "formatter" in una frase

1. In this section, we will implement a data formatter

2. There is a default formatter that shows a value in the decimal format

3. In this example, we will add a hex and binary formatter

4. Every time the value of the default formatter is updated, the registered formatters are notified and take action

5. For example, you can add an octal formatter, a roman numeral formatter, or any other observer that uses your favorite representation