GO Structs and Methods 2

Question 1

When should you prefer a pointer receiver over a value receiver for a Go method?

Accepted Answer

When the method needs to mutate the struct or when the struct is large to avoid copying

Answer

Only when the struct contains a map or slice

Answer

Whenever the method returns a value

Answer

Pointer receivers should always be avoided for simplicity

Question 2

What happens when you assign one struct variable to another in Go?

Accepted Answer

A shallow copy is made; the new variable is independent of the original

Answer

Both variables point to the same underlying memory

Answer

A deep copy is performed, including all nested pointers

Answer

A compilation error occurs because structs are reference types

Question 3

Which of the following correctly creates a pointer to a newly allocated struct in Go?

Accepted Answer

p := &Person{Name: "Bob"}

Answer

p := new Person{Name: "Bob"}

Answer

p := pointer(Person{Name: "Bob"})

Answer

p := *Person{Name: "Bob"}

Question 4

What does struct embedding achieve that explicit field access does not?

Accepted Answer

Promoted methods and fields can be accessed directly without qualifying them with the embedded type's name

Answer

Embedded structs are automatically serialized to JSON with nested keys

Answer

Only embedded interfaces are promoted; embedded struct methods are not promoted

Answer

Embedding copies all fields into the outer struct at compile time, removing the inner type

Question 5

Can two structs in Go be compared with `==`? Under what condition?

Accepted Answer

Yes, if all their fields are comparable types (no maps, slices, or functions)

Answer

No, structs in Go can never be compared directly

Answer

Yes, always, regardless of field types

Answer

Only if the structs implement the `Comparable` interface

Question 6

What is the output of the following Go code?
```go
type Counter struct{ count int }
func (c *Counter) Inc() { c.count++ }
ct := Counter{}
ct.Inc()
ct.Inc()
fmt.Println(ct.count)
```

Accepted Answer

2

Answer

0

Answer

1

Answer

Compilation error

Question 7

In Go, what is a struct tag and where is it commonly used?

Accepted Answer

A string literal in backticks after a field type, commonly used by encoding/json to control serialization

Answer

A compiler directive placed before a struct definition to optimize layout

Answer

A comment format used exclusively by the go vet tool

Answer

A runtime annotation that adds methods to a struct automatically