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Go by Example - Switch

翻译自 https://gobyexample.com/

Go by Example

Go is an open source programming language designed for building simple, fast, and reliable software.

Go by Example is a hands-on introduction to Go using annotated example programs. Check out the first example or browse the full list below.

Go by Example: Switch

golang也有常用的switch语句。

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package main
import "fmt"
import "time"
func main() {
i := 2
fmt.Print("Write", i, " as ")
// 典型的switch结构
switch i {
case 1:
fmt.Println("one")
case 2:
fmt.Println("two")
case 3:
fmt.Println("three")
}
// case后可以跟多个条件,逗号分隔。也有常用的default。
switch time.Now().Weekday() {
case time.Saturday, time.Sunday:
fmt.Println("It's the weekend")
default:
fmt.Println("It's a weekday")
}
// switch后不跟条件判断语句可以模仿if/else的功能
t := time.Now()
switch {
case t.Hour() < 12:
fmt.Println("It's before noon")
default:
fmt.Println("It's after noon")
}
// 变量类型判断的switch语句,其中的type是switch独有的用法。
// 主要用来判断一个interface值的类型。
whatAmI := func(i interface{}) {
switch t := i.(type) {
case bool:
fmt.Println("I'm a bool")
case int:
fmt.Println("I'm an int")
default:
fmt.Println("Don't know type %T\n", t)
}
}
whatAmI(true)
whatAmI(1)
whatAmI("hey")
}
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$: go run switch.go
Write 2 as two
It's a weekday
It's after noon
I'm a bool
I'm an int
Don't know type string

原文链接:Go by Example: Switch