title: Filter a list element starting with a letter in JavaScript
body: <p>I am trying to sort out list elements that starts with 'N' into a new list.
  Why won't this work?</p>
  
  <pre><code>const countries = ['Norway', 'Sweden',  'Denmark', 'New Zealand'];
  
  function firstN(){
    for (let i=0;i&lt;countries.length;i++){
      countries[i].startsWith("N")
      }
  }
  
  let startsWithN = countries.filter(firstN())
  </code></pre>