Quick way to detect empty values via reflection in Go

From what I understand, you want something like:

func IsZeroOfUnderlyingType(x interface{}) bool {
    return x == reflect.Zero(reflect.TypeOf(x)).Interface()
}

When talking about interfaces and nil, people always get confused with two very different and unrelated things:

1. A nil interface value, which is an interface value that doesn’t have an underlying value. This is the zero value of an interface type.
2. A non-nil interface value (i.e. it has an underlying value), but its underlying value is the zero value of its underlying type. e.g. the underlying value is a nil map, nil pointer, or 0 number, etc.

It is my understanding that you are asking about the second thing.

Update: Due to the above code using ==, it won’t work for types that are not comparable. I believe that using reflect.DeepEqual() instead will make it work for all types:

func IsZeroOfUnderlyingType(x interface{}) bool {
    return reflect.DeepEqual(x, reflect.Zero(reflect.TypeOf(x)).Interface())
}