I have a jQuery function that I would like to change to plain JavaScript.
function readZipCodes() {
     var zipCodes = [];
      $.ajax({
           url: 'data/ZipCodeDatabase.csv',
           contentType: "text/csv",
           async: false,
           success: function(text) {
                zipCodes = text.split("\n");
           }
      });
      return zipCodes;
 }
Can you please show me how to rewrite it?
