JavaScript : Add Business days to a date

snippet.js

// https://github.com/lsmith/addBusinessDays/blob/master/addBusinessDays.js
// var d = new Date();
// addBusinessDays(d, numberOfDays);

function addBusinessDays(d,n) {
    d = new Date(d.getTime());
    var day = d.getDay();
    d.setDate(d.getDate() + n + (day === 6 ? 2 : +!day) + (Math.floor((n - 1 + (day % 6 || 1)) / 5) * 2));
    return d;
}