User class and object-oriented programming

So far, we have only worked with interfaces to represent data, and we still want to continue using interfaces when passing data around various components and services. However, there's a need to create a default object to initialize a BehaviorSubject. In Object-oriented Programming (OOP), it makes a lot of sense for the User object to own this functionality instead of a service. So, let's implement a User class to achieve this goal.

Inside the user/user folder, define an IUser interface and a User class provided in UserModule:

src/app/user/user/user.ts
import { Role } from '../../auth/role.enum'

export interface IUser {
  id: string
  email: string
  name: {
    first: string
    middle: string
    last: string
  }
  picture: string
  role: Role
  userStatus: boolean
  dateOfBirth: Date
  address: {
    line1: string
    line2: string
    city: string
    state: string
    zip: string
  }
  phones: IPhone[]
}

export interface IPhone {
  type: string...