title: How to push text value into array
body: <p>I am looking for a JavaScript push method to add value into array, in the style of:</p>
  <pre><code>title = document.getElementById('tit').value;
  description = document.getElementById('desc').value;
  if (localStorage.getItem('itemJson') == null) {
      itemJsonArray = [];
      itemJsonArray.push([title, description]);
      localStorage.setItem('itemJson', JSON.stringify(itemJsonArray));
  }
  </code></pre>