//Method 2
//rearrange the digits to create the highest possible number
function descendingOrder(n){
  let reversed = n.toString().split("").sort((a, b) => b - a).join('');
  return parseInt(reversed) * Math.sign(n);
}
console.log(descendingOrder(463));        // result:  643
console.log(descendingOrder(223744));    // result:  744322