/**
 * @param {number} x
 * @return {number}
 */
var reverse = function(x) {
    let r;
    let sign = Math.sign(x);
    try {
        r = Number.parseInt(String(Math.abs(x)).split('').reverse().join('')||'0');
    } catch (e) {
        r = 0;
    }
    return r > Math.pow(2, 31)-1 ? 0 : sign*r;
};

console.info(reverse(0));