Switch expression behavior in Go - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a switch statement in Go?

A switch statement in Go lets you choose between many options based on the value of an expression. It is like asking multiple questions and running the code for the first true answer.

beginner

How does Go's switch differ from if-else chains?

Go's switch is cleaner and easier to read than many if-else statements. It automatically breaks after a case runs, so you don't need to write break statements like in some other languages.

beginner

What happens if no case matches in a Go switch?

If no case matches, and there is a default case, the default code runs. If there is no default, the switch does nothing and moves on.

intermediate

Can a Go switch expression have multiple values in one case?

Yes! You can list multiple values separated by commas in one case. If the switch expression matches any of those values, that case runs.

intermediate

What is a type switch in Go?

A type switch lets you check the type of an interface value. It helps you run different code depending on what kind of value you have.

What keyword is used to run code when no other case matches in a Go switch?

A else

B default

C fallback

D case

The 'default' case runs when no other case matches in a Go switch.

In Go, what happens after a case block runs in a switch statement?

A The switch automatically stops (breaks).

B It continues to the next case.

C You must write 'break' to stop.

D It throws an error.

Go switch statements automatically break after a case runs, so no explicit 'break' is needed.

Which of these is a valid way to write multiple values in one case in Go switch?

A case (1; 2; 3):

B case [1 2 3]:

C case 1, 2, 3:

D case 1|2|3:

You separate multiple values with commas in one case, like 'case 1, 2, 3:'.

What does a type switch check in Go?

A The type of a variable implementing an interface

B The value of a variable

C The length of a string

D The memory address of a variable

A type switch checks the actual type of an interface value to run different code.

Which statement about Go switch is true?

A Switch always runs all cases.

B Switch cases must be strings only.

C Switch can only check integers.

D You don't need to write 'break' after each case.

Go switch automatically breaks after a case runs; no manual 'break' is needed.

Explain how a switch statement works in Go and how it differs from if-else chains.

Think about how Go chooses which code to run based on a value.

Describe what a type switch is in Go and give an example of when you might use it.

Consider when you have a variable that can hold different types.