만 나이 계산기 군대 빼고

how-old-are-you.js

#!/usr/bin/env node
function howOldAreYou(birth, employment, joinArmy, discharge) {
    if (arguments.length !== 4) {
        console.log(`arguments[yyyy-mm-dd]: 생일, 취업일, 입대, 전역`);
        process.exit();
    }
    var dateBirth = new Date(birth);
    var dateEmployment = new Date(employment);
    var dateJoinArmy = new Date(joinArmy);
    var dateDischarge = new Date(discharge);
    var interval = new Date(dateEmployment - dateBirth - (dateDischarge - dateJoinArmy));

    interval.setYear(interval.getYear() - 70);

    return interval;
}

if (process.argv.indexOf(__filename) !== -1) {
    var dateInterval = howOldAreYou.apply(null, process.argv.slice(2));

    console.log(`${dateInterval.getYear()}년 ${dateInterval.getMonth()}월 ${dateInterval.getDate()}일`);
} else {
    module.exports = function howOldAreYou(birth, employment, joinArmy, discharge) {
        return howOldAreYou.apply(null, arguments);
    };
}