title: How to filter an array of arrays and just return part of each inner array?
body: <p>I have the following array of arrays:</p>
  <pre><code>const myArray = [ ['1', 'first'], ['2', 'second'], ['3', 'third'], ['4', 'fourth'] ]
  </code></pre>
  <p>I want to return an array like:</p>
  <pre><code>[ 'first', 'second', 'third', 'fourth' ]
  </code></pre>
  <p>I'm trying the following filter:</p>
  <pre><code>const res = myArray.filter( elm =&gt; elm[1] )
  </code></pre>
  <p>but it doesn't return the desired filter, just return the same...</p>