Go Data Structures and Interfaces

Assess your knowledge of slices,maps,structs,and interfaces in Go.

1. What data structure in Go is a fixed-size sequence of elements?

array slice map struct

2. Which operations can be performed on a slice in Go?

append len cap delete

3. Maps in Go are thread-safe for concurrent writes without synchronization.

True False

4. What function is used to check if a key exists in a map (hint: the second return value)?

5. What is the result of len(make([]int, 5, 10))?

5 10 0 error

6. Which are valid ways to create a non-nil map in Go?

make(map[string]int) map[string]int{} var m map[string]int new(map[string]int)

7. An empty interface (interface{}) can hold values of any type in Go.

True False

8. What term describes converting an interface value to a concrete type using .(T)?

9. Which data structure is typically implemented using a slice with append and len for LIFO operations?

stack queue tree map

10. Which statements about structs in Go are true?

Can contain fields of different types Must have methods to be used Can be compared with == if all fields are comparable Are reference types

11. A nil interface (interface{}) in Go holds both a nil type and a nil value.

True False

12. What is the capacity of a slice created with make([]int, 0, 5) after appending 3 elements?

13. What happens when you append to a slice that has reached its capacity?

It panics It overwrites existing elements It creates a new underlying array with increased capacity It returns nil

14. Which are interfaces defined in the Go standard library?

io.Reader fmt.Stringer math.Sqrt sort.Interface

15. A struct can implement multiple interfaces in Go.

True False

16. What method must a type implement to satisfy the fmt.Stringer interface?

17. Which data structure in Go uses key-value pairs for efficient lookups?

array slice map struct

18. Which of the following are value types in Go?

int slice struct map

19. The zero value of a slice variable in Go is nil.

True False

20. What is returned when accessing a key that does not exist in a non-nil map (e.g., m["key"] where m is initialized but has no 'key')?

Answered 0 of 0 — 0 correct

Company