next smallest numeric palindrome

numeric-palindrome.js

function processNum(num) {

  var _num  = num + "";
  var _left;
  var _right;
  var _palin;
  
   if (_num.length % 2 === 0) {
      _left = (~~(_num.substr(0, _num.length/2))+1).toString().split('');
      _palin = (~~_left.concat(_left.slice(0).reverse()).join(''));
   } else {
      _left = (~~(_num.substr(0, _num.length/2))+1).toString().split('');
      _right = (~~(_num.substr(_left.length,1))).toString().split('');
      _palin = _left.concat(_right).concat(_left.slice(0).reverse()).join('');
      console.log(_right, _left)
      console.log(_palin)
   }
  return _palin;
}