odin-default-js-exercises/06_leapYears/leapYears.js

const leapYears = function(year) {
    if (year % 4 === 0) {
        if (year % 100 === 0) {
            if (year % 400 === 0) {
                return true;
            } else {
                return false;
            }
        } else {
            return true;
        }
    }
};
// Do not edit below this line
module.exports = leapYears;