Challenge 1: Types

Solve a task combining basic types and interfaces.

Challenge 1: Types

In this challenge you will combine basic types and interfaces to design a Person model. You will define an interface with name, age, and email fields, use it, then extend it with an intersection with Address.

Exercise Person interface and object

Define a Person interface: name: string, age: number, email: string. Create a person object and print its name field.

Show example solution

interface Person {
  name: string;
  age: number;
  email: string;
}

const person: Person = {
  name: "Ada",
  age: 30,
  email: "ada@x.com"
};
console.log(person.name);

Exercise Combine Person with Address

Define an Address interface: city: string, zip: string. Define the PersonWithAddress type as Person & Address. Create an object and print its city field.

Show example solution

interface Person {
  name: string;
  age: number;
  email: string;
}

interface Address {
  city: string;
  zip: string;
}

type PersonWithAddress = Person & Address;

const pa: PersonWithAddress = {
  name: "Ada",
  age: 30,
  email: "ada@x.com",
  city: "Ankara",
  zip: "06000"
};
console.log(pa.city);

Test yourself

What type should the age field be in a Person interface?
- string
- number
- boolean
- "young" | "old"
Show answer

number — Age is a numeric value, so it should be of type number. string is for text, boolean for true/false.

Complete the email field type

interface Person { name: string; age: number; email: ____; }

Show answer

interface Person { name: string; age: number; email: string; }

Person model parts

name: string

Name field
age: number

Age field
email: string

Email field
interface Person

Person model definition

Next lesson: Challenge 2: Functions

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