How Can I Get the reflect.Type of an Interface in Go?

Retrieving the Reflect.Type of an Interface

Problem:

In order to ascertain whether a specific type implements an interface using the reflect package, a reflect.Type must be passed to reflect.Type.Implements(). However, obtaining such a type can be challenging, especially for uninitialized interface types.

Solution:

To get the reflect.Type of an interface, use either of the following approaches:

1. Using the Elem() Method:

   var err error
   t := reflect.TypeOf(&err).Elem()

2. In One Line:

   t := reflect.TypeOf((*error)(nil)).Elem()

In both methods, the Elem() method is employed to obtain the actual type of the interface (*error in this case), providing the necessary reflect.Type for further processing.

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