02. Person

function Person(first, last) {
    this.firstName = first;
    this.lastName = last;

    Object.defineProperty(this, "fullName", {
        set: function(value) {
            const [newFirst, newLast] = value.split(' ');
            if (!newFirst || !newLast) { return;}
            this.firstName = newFirst;
            this.lastName = newLast;
        },
        get: function () {
            return this.firstName + ' ' + this.lastName;
        }
    })
}