Add WeekDays to Date

Question

Will the below code work for adding Weekdays in all possible scenarios? eg, If I add 4 days to a "Thursday", the result should be next "Wednesday". Adding 1 day to a "Friday", "Saturday" or "Sunday" should be the next "Monday".

I am trying to get the nth working day (weekday) after a given day.

var addOneDay=function(date) {
    var result = new Date(date.getTime());
    result.setDate(result.getDate() + 1);
    return result;
};

var addWeekDays = function(date,days) {
    var result = new Date(date.getTime());
    for (var i = 0; i < days; i++) {
        result = addOneDay(result);
        if (result.getDay()=== 6 || result.getDay()=== 0) i--;
    };
    return result;
};

var date = new Date(2016,1,18);
console.log(addWeekDays(date,4));

Answer 1

What is the expected behaviour if you add one weekday to a Saturday? Possible answers are: throw an exception, behavior is undefined, Monday, or Tuesday. Make a decision, and document it.

The use of var funcName = function(…) { … } is a bit unconventional compared to function funcName(…) { … }, but it's not wrong.

Other than that, I think that the code looks correct. For a more efficient way to add large intervals, you could add a number of integral weeks (7 * Math.floor(days / 5)) and advance the remainder (days % 5) the slow way.