Go structs in functions

Question

Hey guys. I'm trying to learn GO so I jumped right into doing code examples in the lessons. But there is a task it seems I cannot handle by myself. It's about having a struct and have to use a function to change one of the structs values. My problem with this is that I don't know how to address the struct right in the functions definition.
So any GO pros out there?

Answer 1

You need to either pass the struct as the function argument or create a new struct in the function

Answer 2

It is better to pass by reference

Answer 3

If you want to change the value of the struct and use them in your program

Answer 4

Passing by reference is also more efficient

Answer 5

Ok

Answer 6

Passing by reference means to send the memory adress as a argument, which is got by using the ampersand '&', but whenever you want yo use that struct it needs to be dereferenced with the asterix '*'

Answer 7

type Teststruct struct {attribute1 int}

*p := Teststruct
testfunction (&p) {.. }
func testfunction (&p) {
(*p).attribute1 := 4
}

Answer 8

You're welcome

Answer 9

Okay let's assume I have a struct like
type Teststruct struct {attribute1 int}

have a pointer used on it like

*p := Teststruct

and it should be passed to the function like

testfunction (&p) {.. }

would it be right to define it like that?

func testfunction (&p) {}
or like func testfunction (type xy struct {Val int}) {...}.?

Answer 10

Can you maybe give me an example since I'm not sure if I understand pass by reference?

Answer 11

Cool you really helped me out. Thank you very much