GO (switch 與 type)

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// switch project main.gopackage mainimport ("fmt")type Element interface{}type List []Elementtype Person struct {name stringage  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] = 10086list[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)}}}

輸出：

list[0] is an int and its value is 10086list[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)