{ "_id" : ObjectId( "4e00e83608146e71e6edba81" ),
  ....
  "text" : "Text now exists in the database"}

{ "_id" : ObjectId( "4e00e83608146e71e6edba81" ),
  ....
  "text" : "Text now exists in the database",
  "tHash" : -4375633875013353634 }

var hashCode = function(s) {
    if (s == null) return 0;
    if (s.length == 0) return 1;
    var hash = 0;
    for (var i = 0; i < s.length; i++) {
        hash = ((hash << 5) - hash) + s.charCodeAt(i);
        hash = hash & hash; // Convert to 32bit integer
    }
    return hash;
};