How to get zero value of a field type

Question

I have a struct containing many fields - I\'ve figured out how to extract the field name, value, and tag information using reflection. What I also want to do is to determine if

Answer 1

I couldn't post a comment, but the accepted answer panics if you provide a struct with any unexported fields. The trick I've found is to check if the field can be set - essentially ignoring any unexported fields.

func isZero(v reflect.Value) bool {
    switch v.Kind() {
    case reflect.Func, reflect.Map, reflect.Slice:
        return v.IsNil()
    case reflect.Array:
        z := true
        for i := 0; i < v.Len(); i++ {
            z = z && isZero(v.Index(i))
        }
        return z
    case reflect.Struct:
        z := true
        for i := 0; i < v.NumField(); i++ {
            if v.Field(i).CanSet() {
                z = z && isZero(v.Field(i))
            }
        }
        return z
    case reflect.Ptr:
        return isZero(reflect.Indirect(v))
    }
    // Compare other types directly:
    z := reflect.Zero(v.Type())
    result := v.Interface() == z.Interface()

    return result
}