在不使用反射的情况下检查Go中的接口值是否为零

Question

I need to check if an interface value is `nil.

But by using reflection it is giving me an error:

reflect: call of reflect.Value.Bool on struct Value.

Through nil it is not giving an error for nil value.

Answer 1

There are two things: If y is the nil interface itself (in which case y==nil will be true), or if y is a non-nil interface but underlying value is a nil value (in which case y==nil will be false).

Here's an example.