In practice, we often encounter situations where we need to take an existing object, and then extend it to create slightly different variants.
For example, you could have a user object.
javascript
1let user = {
2 firstName: "John",
3 lastName: "Doe",
4
5 get fullName() {
6 return `${this.firstName} ${this.lastName}`;
7 },
8
9 set fullName(value) {
10 [this.firstName, this.lastName] = value.split(" ");
11 },
12};And then based on user, you could have admin, editor, and visitor, which are variants of user.
javascript
1let admin = {
2 firstName: "John",
3 lastName: "Doe",
4 role: "Admin",
5
6 get fullName() {
7 return `${this.firstName} ${this.lastName}`;
8 },
9
10 set fullName(value) {
11 [this.firstName, this.lastName] = value.split(" ");
12 },
13};
14
15let editor = {
16 firstName: "John",
17 lastName: "Doe",
18 role: "Editor",
19
20 . . .
21};
22
23let visitor = {
24 firstName: "John",
25 lastName: