var TEST = function () {
    
    const range = [-2147483648, 2147483647];
    
    return {
        exec: function (num) {
            const numStr = '' + num;
            let invNumStr = '', i = numStr.length;
            while (numStr[--i]) {
                if (numStr[i] === '-') {
                    invNumStr = '-' + invNumStr;
                    break;
                }
                invNumStr += numStr[i];
            }
            const res = parseInt(invNumStr) || 0;
            return (res < range[0] || range[1] < res) ? 0 : res;
        }
    };
}();