title: Jquery - Simple Array, pushing item in if its not there already, removing item if it is there
body: <p>I'm building a simple filtering system, I simply want to add a string to an array and remove it if its already there on click of a link. I'll try to explain the best I can..</p>
  
  <pre><code>$(document).ready(function(){
      //so I start with an empty array
      var filters [];
      //when a link is clicked I want to add it to the array..
      $('li a', context).click(function(e){
          //so I get the value held in the data-event attribute of the clicked item example: "john"
          newFilter = $(this).attr('data-event');
          //this is where I get stuck, I want to test to see if the string I now have
          //in 'newFilter' is in the array already or not.. if it is in the array I
          //want to remove it, but if it doesnt exist in the array i want to add it..
          if(jQuery.inArray(newFilter, filters){
              //add to array
          } else {
             //remove from array
          };
      e.preventDefault();
      });
  });
  </code></pre>