title: filtered array length
body: <p>Hello I want to display a message if a filtered array length === 0</p>
  
  <pre><code>users.filter((user) =&gt; {
      return user.name.includes('john')
  }).map((user, index) =&gt; {
      console.log(user)   
  })
  </code></pre>
  
  <p>i´m not sure where to put it. could it be inside the map? what´s the correct way?</p>