problem.js

var woman = new Person('Kate', 'Khowalski');

woman.firstName; // 'Kate'
woman.lastName; // 'Khowalski'
woman.fullName; //'Kate Khowalski
woman.species; // human

/*
 * Change firstName
 */

woman.firstName = 'Yulia';
woman.firstName; // 'Yulia'
woman.lastName; // 'Khowalski'
woman.fullName; // 'Yulia Khowalski' - How to do that !?
woman.species = 'fish';
woman.species; // human - No, you can't change this property.

/*
 * Change fullName
 */

woman.fullName = 'Joana Stevens';
woman.firstName; //Joana
woman.lastName; //Stevens