Type switch

main.go

package main

import (
	"fmt"
	"time"
)

func main() {
	typeSwitch := func(v interface{}) {
		switch v.(type) {
		case string:
			fmt.Printf("v, %v is string\n", v)
		case int:
			fmt.Printf("v, %v is int\n", v)
		case float64:
			fmt.Printf("v, %v is float64\n", v)
		case time.Duration:
			fmt.Printf("v, %v is time.Duraiton\n", v)
		default:
			fmt.Println("v is unrecognized")
		}
	}

	typeSwitch(1)
	typeSwitch(1.1)
	typeSwitch("text")
	typeSwitch(time.Second * 1)
	typeSwitch(time.Now())
  
	// $ go run .
	// v, 1 is int
	// v, 1.1 is float64
	// v, text is string
	// v, 1s is time.Duraiton
	// v is unrecognized
}