Switch

• 不用寫 break
• fallthrough 用法：這個 case 做完，一併執行下個 case

Example

package main

import (
    "fmt"
    "time"
)

func main() {
    // 一般用法
    switch time.Now().Weekday() {
    case time.Sunday:
        fmt.Println("Today is Sunday")
    case time.Saturday:
        fmt.Println("Today is Saturday")
    default:
        fmt.Println("Today is weekday")
    }

    // 宣告變數寫法
    switch hour := time.Now().Hour(); {
    case hour > 20:
        fmt.Println("> 20")
    case hour <= 20:
        fmt.Println("<= 20")
    }

    // fallthrough: 這個 case 做完，一併執行下個 case
    // 會印出 2 3
    number := 2
    switch number {
    case 1:
        fmt.Println("1")
        fallthrough
    case 2:
        fmt.Println("2")
        fallthrough
    case 3:
        fmt.Println("3")
    }
}