Mastering Go - Second Edition

Using switch with interface and data types

In this subsection, you will learn how to use the switch statement to differentiate between different data types using the Go code of switch.go, which will be presented in four parts. The Go code of switch.go is partially based on useInterface.go, but it will add another type named rectangle and will not need to implement the methods of any interface.

The first part of the program is next:

package main 
 
import ( 
    "fmt" 
) 

As the code in switch.go will not work with the interface defined in myInterface.go, there is no need to import the myInterface package.

The second part is where you define the three new data types that will be used in the program:

type square struct { X float64 } type circle struct ...