Replace methode for a custom type array in golang

I am trying to add or replace (or add) a field in a custom type that is nothing but an array of structs based on a struct field. Basically something simple, have a look here:

https://play.golang.org/p/Fb04g4Oq1C

Line 15 is where I am struggling. The compiler does not get to the array behind my type and does not want to address the array values by there index. How can I achieve that the given part of the array will be replaced?

Thanks!

Replace

*v[i] = n

with

(*v)[i] = n

The former means "take what v[i] points to", while the latter, "take what v points to and take i'th element".

As mentioned in this answer, a slice is already a kind of pointer, rendering a pointer to a slice totally useless.

That means a version of your code using [] instead of a pointer to [] works just fine.
See this example:

func (v VarBucket) AddOrReplace(n Var) VarBucket {
	for i, vars := range v {
		if vars.Name == n.Name {
			v[i] = n
			fmt.Println("Replaced")
			return v
		}
	}
	v = append(v, n)
	fmt.Println("Added")
	return v
}

With:

v_a := Var{Name: "a", Value: "A"}
v_b := Var{Name: "b", Value: "B"}
v_c := Var{Name: "a", Value: "C"}

b := VarBucket{}
b = b.AddOrReplace(v_a) // add
fmt.Printf("%v\n", b)
b = b.AddOrReplace(v_b) // add
fmt.Printf("%v\n", b)
b = b.AddOrReplace(v_c) // replace v_a
fmt.Printf("%v\n", b)

Output:

Added
[{a A}]
Added
[{a A} {b B}]
Replaced
[{a C} {b B}]