multiple_errors.go

package main

import (
	"fmt"
	"math/rand"
	"time"
)

type ErrorA struct {}
func (e *ErrorA) Error() string { return "error a" }

type ErrorB struct {}
func (e ErrorB) Error() string { return "error b" }

func GetError() error {
	now := time.Now().UnixNano()
	r := rand.New(rand.NewSource(now))

	if r.Int() % 2 == 0 {
		return &ErrorA{}
	} else {
		return ErrorB{}
	}
}

func ErrorSwitch() {
	err := GetError();
	switch err.(type) {
		case nil: 	
			fmt.Println("No error")
		case ErrorB:
			fmt.Println("error type b")
		case *ErrorA:
			fmt.Println("error type a")
		case error:
			fmt.Println("generic error")
	}
}

func main() {
	ErrorSwitch()
}