https://leetcode.com/problems/reverse-integer/

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/**
 * @param {number} x
 * @return {number}
 */
var reverse = function(x) {
    x = '' + x;
    let res = x[0] === '-'
        ? '-' + x.substr(1).split('').reverse().join('')
        : x.split('').reverse().join('');
    res = parseInt(res, 10);
    // Math.pow(2, 31) - 1
    return (res < -2147483648 || res > 2147483647) ? 0 : res;
};

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