How is the transfer of elements between functions and structures implemented in Golang?

In Go, passing elements between functions and structures can be done in two main ways: by value and by pointer.

• Passing by value: the structure or variable itself is copied, and changes inside the function do not affect the original.
• Passing by pointer: the address of the structure or variable is passed, allowing the function to modify the original data.

Example:

package main
import "fmt"

type Person struct {
    Name string
    Age  int
}

func updateByValue(p Person) {
    p.Age = 30 // only the copy will change
}

func updateByPointer(p *Person) {
    p.Age = 30 // the original will change
}

func main() {
    person := Person{Name: "Ivan", Age: 25}
    updateByValue(person)
    fmt.Println(person.Age) // 25

    updateByPointer(&person)
    fmt.Println(person.Age) // 30
}

Thus, if you need to modify data inside a function, pass a pointer to the structure. If no modifications are needed, you can pass by value.