store.js

bizDaysMonths: state => {
            return [
                {},
                {
                    month: 'jan',
                    biz_days: moment('2018-01-01').monthBusinessDays().length
                },
                {
                    month: 'feb',
                    biz_days: moment('2018-02-01').monthBusinessDays().length
                },
                {
                    month: 'mar',
                    biz_days: moment('2018-03-01').monthBusinessDays().length
                },
                {
                    month: 'apr',
                    biz_days: moment('2018-04-01').monthBusinessDays().length
                },
                {
                    month: 'may',
                    biz_days: moment('2018-05-01').monthBusinessDays().length
                },
                {
                    month: 'jun',
                    biz_days: moment('2018-06-01').monthBusinessDays().length
                },
                {
                    month: 'jul',
                    biz_days: moment('2018-07-01').monthBusinessDays().length
                },
                {
                    month: 'aug',
                    biz_days: moment('2018-08-01').monthBusinessDays().length
                },
                {
                    month: 'sep',
                    biz_days: moment('2018-09-01').monthBusinessDays().length
                },
                {
                    month: 'oct',
                    biz_days: moment('2018-10-01').monthBusinessDays().length
                },
                {
                    month: 'nov',
                    biz_days: moment('2018-11-01').monthBusinessDays().length
                },
                {
                    month: 'dec',
                    biz_days: moment('2018-12-01').monthBusinessDays().length
                }
            ];
        },
        bizDaysYear: getters => {
            let bdays = getters.bizDaysMonths().map(function(i) {
                return i.biz_days;
            });
            return bdays.reduce(function(prev, curr) {
                return prev + curr;
            });
        }