title: What are the parameters for the number Pipe - Angular 2
body: <p>I have used the number pipe below to limit numbers to two decimal places.</p>
  
  <pre><code>{{ exampleNumber | number : '1.2-2' }}
  </code></pre>
  
  <p>I was wondering what the logic behind '1.2-2' was? I have played around with these trying to achieve a pipe which filters to zero decimal places but to no avail.</p>