TypeScript Quiz_type aliases, union type, intersection type, enum

2022.03.29

#1

Person has name, age, address. Please select answers that has compile error.

type Info = {
  name: string,
  age: number
}
type Person = Info & {
  address: string
}

2.

interface Info {
  name: string,
  age: number
}
type Address = {
  address: string
}
type Person = Info & Address;

3.

type Info = {
  name: string,
  age: number
}
type Address = {
  address: string
}
type Person = Info & Address;

4.

interface Info {
  name: string,
  age: number
}
interface Address {
  address: string
}
interface Person = Info & Address;

5.

interface Info {
  name: string,
  age: number
}
interface Address {
  address: string
}
type Person = Info & Address;

6.

type Person = {
  name: string,
  age: number
}
type Person = {
  address: string
}

7.

type Info {
  name: string,
  age: number
}
type Person extends Info {
  address: string
}

#2

Company A uses 8 advertisement platform: Admob, Applovin, AdColony, IronSource, Inmobi, Kidoz, UnityAds, Vungle. Please make AdsPlatform that is a string type that can be one of the platforms.

#3

Does TypeScript advise to use Heterogeneous enums? (Y/N)

enum BooleanLikeHeterogeneousEnum {
    No = 0,
    Yes = "YES",
}

# 4

Reverse mapping can be applied for both numeric enums and string enums (T/F)

Answers.

1. A4, 6, 7

2.

enum Platform {   
  Admob, 
  Applovin, 
  AdColony, 
  IronSource, 
  Inmobi, 
  Kidoz, 
  UnityAds, 
  Vungle 
}  
type AdsPlatform = keyof typeof Platform;

3. N

4. F