TypeScript for Beginners - Using Default Values

The video tutorial explains how to assign default values to function parameters using the equal sign. It demonstrates that if a parameter is not provided, the default value is used, eliminating the need to check for undefined values. The tutorial shows how to test this by refreshing a web browser to see the default role as 'normal user' and how passing a different role, like 'admin', overrides the default. This approach simplifies code by reducing conditional checks.

What symbol is used to assign a default value to a function parameter?

• Colon (:)

• Equal to (=)

• Asterisk (*)

• Ampersand (&)

What happens if a parameter with a default value is not provided when the function is called?

• The function throws an error

• The default value is used

• The function returns undefined

• The function skips the parameter

Why is it unnecessary to check for undefined values when using default parameters?

• Because the function ignores undefined values

• Because the function automatically assigns a random value

• Because the default value is always used

• Because the default value is used if no value is provided

How can a default parameter value be overridden?

• By setting the parameter to null

• By using a special override keyword

• By passing a different value when calling the function

• By changing the function definition

In the demonstration, what role value is shown when no parameter is passed?

• Guest

• Admin

• Normal user

• Superuser