Interfaces
An interface is a Go mechanism for defining behavior that is implemented using a set of methods. Interfaces play a key role in Go and can simplify the code of your programs when they have to deal with multiple data types that perform the same task—recall that fmt.Println() works for almost all data types. But remember, interfaces should not be unnecessarily complex. If you decide to create your own interfaces, then you should begin with a common behavior that you want to be used by multiple data types.
Interfaces work with methods on types (or type methods), which are like functions attached to given data types, which in Go are usually structures (although we can use any data type we want).
As you already know, once you implement the required type methods of an interface, that interface is satisfied implicitly.
The empty interface is defined as just interface{}. As the empty interface has no methods, it means that it is already implemented by all data...