JavaScript - Object reference vs copy

jsObjRefVsCopy.js

const person = {
  name: 'Pete'
};

const newPerson1 = person;  // person is referenced (not a copy)

const newPerson2 = {
  ...person                 // perons is spread (copied) and the reference is not used
};

person.name = 'Jan';

console.log(person);        // Jan
console.log(newPerson1);    // Jan - because newPerson1 uses a pointer to person
console.log(newPerson2);    // Pete - because the original value was copied into newPerson2

From the Udemy class, React - The Complete Guide (incl Hooks, React Router, Redux)