text: Q:
  
  Is $(() => {}) an jQuery anonymous or ready function in ES6?
  
  This is the first time seeing this. I have looked this up and have not found anything pertaining to this syntax of $(()).
  <script>
      'use strict';
      $(() => {
          // code goes here
      });
  </script>
  
  A:
  
  This is, for the most part, the equivalent of:
  <script>
      'use strict';
      $(function() {
          // code goes here
      });
  </script>
  
  Which, assuming the $ variable is assigned to the jQuery library, will be a "normal" document ready callback function.
  You can learn more about arrow functions here: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/Arrow_functions
  
  