Exercise:

• Create a type alias called Person with the following properties: name (string) age (number) isStudent (boolean)

• Write a function introduce that accepts a parameter of type Person and logs a message like: "Hi, I'm [name], [age] years old, and I am [not] a student."

Exercise:

• Create an interface Car with the following properties: brand (string) model (string) year (number) startEngine() (method that returns a string: "Engine started")
• Implement this interface in a class called SportsCar.
• Create an instance of SportsCar and call its startEngine method.

Exercise:

• Write a function addNumbers that takes two numbers and returns their sum.
• Use the function type syntax to define the type of the function.
• Add a second overload for addNumbers that works with strings (concatenates them).

Exercise:

• Define a TypeScript object book with the following properties: title (string) author (string) price (number) discount (optional, number)
• Write a function calculateDiscountedPrice that takes the book object and a discount percentage, and calculates the discounted price. If no discount is provided, return the original price.

Exercise: Create a class Rectangle with the following: Properties: width (number), height (number) Methods: area() – returns the area of the rectangle. perimeter() – returns the perimeter of the rectangle. Create another class Square that extends Rectangle. Add a constructor to initialize the square using a single side length. Create instances of both classes and calculate their area and perimeter.

Exercise:

• Write a function getLength that takes an argument which could be either a string or an array and returns its length.
• Use type assertion to implement this, ensuring TypeScript knows which type is being handled in specific cases.

Exercise:

• Create a type alias Address with properties city (string), country (string), and zipCode (number).
• Create a class User with the following: Properties: name (string), age (number), and address (of type Address).
• A method greet() that logs a message like "Hi, my name is [name], and I live in [city], [country]."
• Write a function isAdult that accepts an object of type User and returns true if the user's age is 18 or above.