abstraction-primitives

user.ts

export type DateOfBirth = {
  day: number;
  month: number;
  year: number;
};

export type User = {
 firstName: string | undefined;
 lastName: string | undefined;
 dateOfBirth: DateOfBirth | undefined;
 license: number | undefined;
 planType: 'free' | 'premium' | 'pro';
 numAccounts: number;
};

const createUser = () => {
  const user = {
   firstName: undefined,
   lastName: undefined,
   dateOfBirth: undefined,
   license: undefined,
   planType: 'free',
   numAccounts: 1
  };

  const setName = (firstName, lastName) => { 
    user.firstName = firstName;
    user.lastName = lastName;
   } 
    /* ... other setters */
  const getName = () => {
    const { firstName, lastName } = user;
    return { firstName, lastName};
   }
    /* ... other getters */
  const getUserDetails = () => {
    return Object.freeze({...user});
  }

  return Object.freeze({
   getName,
   setName,
   getUserDetails
 });
};

const isUserEligibleForLicense = (user: User) => {
    // write code here that checks if the user's age is >= 16
}

const isPremiumUser = (user: User) => {
    // write code here that checks if the user's plantype is premium;
}

const isProUser = (user: User) => {
    // write code here that checks if the user's plantype is 'pro';
}

const isFreeUser = (user: User) => {
    // write code here that checks if the user's plantype is 'free';
}
...