My object is not updated even if I use the pointer to a type to update it

Question

I store some Individual objects in a slice. Before appending it to the slice I print the name of the Individual object.

After I have stored

Answer 1

Two things to fix this:

• You need the methods attach via a "pointer" method, otherwise the name is only changed inside the method.
• You need to use pointers for the actual Person variables, since they need to implement an interface

type Individual interface {
    GetName() *string
    SetName(name string)
}

type Person struct {
    name string
}

// Implement functions of the Individual interface
func (p Person) GetName() *string  {
    return &p.name
}

func (p *Person) SetName(newName string)  {
    p.name = newName
}


var individuals []Individual

func main() {
    person := &Person{name: "Steve"}
    fmt.Println(person)

    individuals = append(individuals, person) // append Person to slice
    p1 := individuals[0]     // Retrieve the only Person from slice
    p1.SetName("Peter")      // Change name
    fmt.Println(p1)          // Prints "Steve"
    fmt.Println(person)      // Prints "Steve"
}

Example on Go Playground.