mutable object

let object1 = {"nama" : "nasution", "alamat": "mikuasi"};
let object2 = object1;
console.log(object2); //{ nama: "nasution", alamat: "mikuasi" }
object2.nama = "juliar";
console.log(object2); //{ nama: "juliar", alamat: "mikuasi" }
console.log(object1); //{ nama: "juliar", alamat: "mikuasi" }