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258. Add Digits #3

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jzhangnu opened this issue Jun 23, 2016 · 0 comments

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jzhangnu commented Jun 23, 2016 •

edited

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Solution 1

var addDigits = function(num) {
    while(num >= 10){
        num = parseInt(num/10) + num%10;
    }
    return num
};

Solution 2

var addDigits = function(num) {
    var rst = 0;
    Array.prototype.forEach.call(num + '', function (v) { rst += +v; });
    return rst < 10 ? rst : addDigits(rst);
};

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