TypeScript for Beginners - Using Optional Parameters

The video tutorial explains the concept of optional parameters in functions. It starts by discussing the need for optional parameters when not all arguments are required for a function to work. The tutorial then demonstrates creating a 'display' function that takes three arguments: ID, name, and role. It shows how to make the 'role' parameter optional using a question mark and handle cases where the parameter is not provided, ensuring the function does not display 'undefined'. The tutorial emphasizes the importance of checking for undefined values and provides a step-by-step guide to implementing this logic.

What error message do you receive if you call a function with fewer arguments than it expects?

• Unexpected token

• Syntax error

• Function not defined

• Expected 3 arguments but got only 2

What are the three arguments taken by the 'display' function?

• Name, ID, age

• Name, age, role

• ID, name, role

• ID, age, role

Why is it important to check if a parameter is undefined when using optional parameters?

• To ensure the function runs faster

• To make the code more readable

• To prevent displaying 'undefined' in the console

• To avoid syntax errors

How can you make a parameter optional in a function?

• By using an exclamation mark (!)

• By using a dollar sign ($)

• By using a question mark (?)

• By using an asterisk (*)

What happens if an optional parameter is not provided when a function is called?

• The parameter will be assigned 'undefined'

• The function will not execute

• The function will throw an error

• The parameter will be assigned a default value