Enum with switch pattern in C Sharp (C#) - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is an enum in C#?

An enum (short for enumeration) is a special data type that lets you define a set of named constants. It helps make code more readable by using names instead of numbers.

beginner

How does the switch pattern matching work with enums in C#?

Switch pattern matching lets you check an enum value and run code based on which named constant it matches, making the code clear and easy to follow.

intermediate

Why use switch pattern matching instead of if-else with enums?

Switch pattern matching is cleaner and easier to read when checking multiple enum values. It also helps the compiler warn you if you forget to handle some enum cases.

beginner

Write a simple enum declaration for days of the week in C#.

enum DayOfWeek { Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday }

beginner

Show a switch pattern matching example using the DayOfWeek enum to print if it's a weekend or weekday.

DayOfWeek day = DayOfWeek.Saturday; switch (day) { case DayOfWeek.Saturday or DayOfWeek.Sunday: Console.WriteLine("It's the weekend!"); break; default: Console.WriteLine("It's a weekday."); break; }

What does an enum represent in C#?

A A set of named constants

B A method to switch between classes

C A type of loop

D A variable that changes type

An enum defines a set of named constants to represent related values clearly.

Which keyword is used to define an enum in C#?

A pattern

B class

C enum

D switch

The 'enum' keyword declares an enumeration type.

In switch pattern matching with enums, how do you match multiple cases together?

A Using 'or' between cases

B Using commas between cases

C Using 'and' between cases

D Using separate switch statements

You can use 'or' to combine multiple enum cases in one case block.

What happens if you forget to handle an enum value in a switch statement?

A The program crashes immediately

B The compiler may warn you if you use pattern matching

C The missing case is handled automatically

D The switch statement ignores the enum

With pattern matching, the compiler can warn about unhandled enum cases.

Which of these is a valid enum declaration?

A enum Color: int { Red, Green, Blue }

B enum Color = { Red, Green, Blue }

C enum Color() { Red, Green, Blue }

D enum Color { Red, Green, Blue }

The correct syntax uses 'enum Name { values }' without '=' or parentheses.

Explain how to use an enum with a switch pattern in C# to handle different cases.

Think about how you check the enum value and run code for each named constant.

Describe the benefits of using switch pattern matching with enums compared to if-else statements.

Consider how the code looks and how the compiler helps you.