[Nexus]

function User(fullName) {
    this.fullName = fullName;

    Object.defineProperties(this, 'fullName', {
        get: function() {
            return this.firstName + ' ' + this.lastName;
        },

        set: function(value) {
            var names = value.split(' ');
            this.firstName = names[0];
            this.lastName = names[1];
        }
    })
}