JQuery - Best Practices

Best practices:

1. Save selection in a variable if the selection needs to make multiple time.
   Explanation:  jQuery doesn't do caching of selections and for every selection lot of code runs behind the scene
2. Use 'if($("element").length)' instead of  'if($("element"))' to make sure selection has records
   Explanation:  Any selection using $() always returns an object and object always evaluates to TRUE, even if selection doesn't contain any elements.
   'if($("element"))' will return '[]' which is treated as empty object