Rust Programming Master Class from Beginner to Expert - Option Enum

This tutorial covers the option enum in Rust, explaining its importance in handling optional values and error management. The option enum has two variants: none, indicating absence of a value, and some, indicating presence of a value. The tutorial provides examples of using option enum with different data types and demonstrates how to use it in functions. It also highlights the use of match statements to handle different variants and discusses the scope of variables within match blocks. The tutorial concludes with a brief mention of the result enum, which will be covered in a subsequent tutorial.

What are the two enums frequently used in Rust for handling optional values and errors?

• Enum and Struct

• Match and If

• Some and None

• Option and Result

What are the two variants of the Option Enum?

• Some and None

• Present and Absent

• Success and Failure

• True and False

In the given example, what does the 'None' variant represent for the disease variable?

• Unknown disease

• Multiple diseases

• Absence of a disease

• Presence of a disease

Which function is used to extract the value from the Some variant in Rust?

• unwrap

• extract

• get

• fetch

What happens if you try to unwrap a None variant?

• Returns an empty string

• Returns None

• Causes a runtime error

• Returns a default value

How can Option Enum be used with vectors in Rust?

• By converting vectors to strings

• By using the None variant

• By using vectors as keys

• By encapsulating vectors inside the Some variant

What is the purpose of the match statement when working with Option Enum?

• To sort values

• To check and handle different variants

• To iterate over elements

• To convert types

When passing an Option Enum as a function parameter, what should the function return if the input is None?

• The input value

• An error message

• A default value

• None

What is the output type of a function that takes an Option Enum as input and returns a squared value?

• Float

• Integer

• Option with None variant

• Option with Some variant

Which statement is generally used with enums in Rust, but is not a strict requirement?

• if statement

• match statement

• while loop

• for loop