es6 how to prevent change data when clone code example

Example 1: set variable to object without editing old object js

// [Object1]<--------- myObj

const tempMyObj = Object.assign({}, myObj);

// [Object1]<--------- myObj
// [Object2]<--------- tempMyObj

Example 2: best way to clone an object in javascript

const person = {
    firstName: 'John',
    lastName: 'Doe'
};


// using spread ...
let p1 = {
    ...person
};

// using  Object.assign() method
let p2 = Object.assign({}, person);

// using JSON
let p3 = JSON.parse(JSON.stringify(person));