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

Getting the reflect.Type of an Interface

When working with interfaces in the reflect package, it's necessary to obtain a reflect.Type object to determine if a given type implements the interface. This article explores how to retrieve the reflect.Type of an interface.

Determining Whether a Type Implements an Interface

The reflect.Type.Implements() method takes a reflect.Type object and returns a boolean indicating whether the type implements the specified interface. However, obtaining the reflect.Type of an uninitialized interface type can pose challenges as accessing the Kind() method on such a type will panic.

Solution: Getting the Reflect.Type of an Interface

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

Method 1:

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

This method dereferences the &err pointer to get the actual error type and then uses the Elem() method to retrieve the reflect.Type of the underlying interface.

Method 2 (One-liner):

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

This one-liner achieves the same result as Method 1 by directly creating a nil pointer to the interface and then using Elem() to extract the reflect.Type of the interface.

With either method, you can now use the obtained reflect.Type object to check if a type implements the interface using reflect.Type.Implements().

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