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GO (switch 与 type)
痞子汤 · · 3712 次点击 · · 开始浏览这是一个创建于 的文章,其中的信息可能已经有所发展或是发生改变。
// 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)有疑问加站长微信联系(非本文作者)
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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)