reverence vs value

"use strict";
const student = {
    name : 'Asep',
    age : 23,
};

const employee = {
    title: 'QA',
    student};
employee.name = 'Lana';

const arr = ['Asep','Lana', 'Dadang'];
const names = [...arr];
names[2] =  'goday';

// eval("var z = 5");
// console.log(z);
// let x =3;
// delete x; 

// console.log(x);
// delete student.age
const naruto = {
    username : 'Na',
    age : 24
};

const sasuke = {
    ...naruto
};
sasuke.username = 'sa';

const boys = {
    name: 'Asep',
    age: 23,
};

const girls = {
    nama: 'Supi',
    umur: 18,
}

const childs = {
    boys,
    girls
};

console.log(childs);