title: Toggling localStorage item
body: <p>I want to create a toggle function for my localStorage as I am trying to install a dark mode on my site and I want it to remember the user's choice.</p>
  <p>I want it load the current preference on page load, if one has been made, and then toggle the state on click. My code is below - however I am clearly making some error on my attempt to toggle the localStorage state.</p>
  <pre><code>// ON PAGE LOAD, IF USER PREFERS DARK, ADD DARK CLASS TO HTML
  if (window.localStorage.getItem('preferDark')) {
       $('html').toggleClass('dark');
     }
  
  // TOGGLE STATE ON CLICK
  $('.wrapper').click(function(){
    if (window.localStorage.getItem('preferDark', true)) {
      window.localStorage.setItem('preferDark', false);  
  } else {
      window.localStorage.setItem('preferDark', true); 
    }
    $('html').toggleClass('dark');
  });
  </code></pre>
  <p>I know there are various localStorage toggle questions out there but I can't find one quite the same as mine.</p>