On Thu, Jan 10, 2019 at 3:40 PM <xinhu.li...@gmail.com> wrote:
>
> I want to append a nil value using reflect.Append(), but I got a panic:
> reflect: call of reflect.Value.Set on zero Value.
>
> This is my code.
>
> s := make([]interface{}, 10)
> v := reflect.ValueOf(nil)
> reflect.Append(reflect.ValueOf(s), v)
>
> So is there a way i can append nil? Currently I do this as workaround:
>
> s := make([]interface{}, 10)
> s0 := make([]interface{}, 1)
> r := reflect.AppendSlice(reflect.ValueOf(s), reflect.ValueOf(s0))
>
> It works but I think there must be a better way.
First you have to clearly distinguish between nil, an uninitialized
value with no type, and the value interface{}(nil), which is an
uninitialized value of type interface{}. You want the latter. Then,
it's always a bit awkward to work with interface types with the
reflect package, because the reflect package naturally tries to look
for the value stored in the interface type, whereas you actually want
the interface type.
Here is one way to do it:
https://play.golang.org/p/Qt5-AmYa9Mk
Ian
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