[Algorithm] 17 week(5.09 ~ 5.15) 2/3

2160. Minimum Sum of Four Digit Number After Splitting Digits

var minimumSum = function(num) {
    const splitNum = String(num).split('');
    const sortedNum = [...splitNum].sort((a, b) => a - b);
    
    return Number(sortedNum[0] + sortedNum[2]) + Number(sortedNum[1] + sortedNum[3]);
};