GO (switch 与 type)

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// switch project main.go
package main

import (
	"fmt"
)

type Element interface{}
type List []Element

type Person struct {
	name string
	age  int
}

func (p *Person) String() string {
	return fmt.Sprintf("(name: %s - age: %d)\n", p.name, p.age)
}

func main() {
	list := make(List, 4)
	list[0] = 10086
	list[1] = "Hello, World!"
	list[2] = Person{name: "Dennis", age: 34}
	list[3] = &list[2]
	for index, element := range list {
		switch value := element.(type) {
		case int:
			fmt.Printf("list[%d] is an int and its value is %d\n", index, value)
		case string:
			fmt.Printf("list[%d] is a string and its value is %s\n", index, value)
		case Person:
			fmt.Printf("list[%d] is a Person and its value is %s\n", index, value.String())
		default:
			fmt.Printf("list[%d] is of a different type (%v)\n", index, value)
		}
	}
}

输出：

list[0] is an int and its value is 10086
list[1] is a string and its value is Hello, World!
list[2] is a Person and its value is (name: Dennis - age: 34)

list[3] is of a different type (0xc0420400e0)

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