const INT_MAX = 2147483647;
let y = 0;

if (x > 0 && x < 10) {
  return true;
} else {
  let str = x.toString(),
    length = str.length,
    total = 0;

  for (let index = 0; index < length; index++) {
    let num = parseInt(str[index]) * Math.pow(10, index);
    total += num;
  }
  if (total > INT_MAX
    || total < -(1 + INT_MAX)
    || x > INT_MAX
    || x < -(1 + INT_MAX)) {
    return false;
  } else if (total === x) {
    return true;
  } else {
    return false;
  }
}