參考連結：https://studygolang.com/articles/13389

switch sExpr {
case expr1:
    some instructions
case expr2:
    some other instructions
case expr3:
    some other instructions
default:
    other code
}

sExpr和expr1、expr2、expr3的型別必須一致。Go的switch非常靈活，表示式不必是常量或整數，執行的過程從上至下，直到找到匹配項；

而如果switch沒有表示式，它會匹配true。 Go裡面switch預設相當於每個case最後帶有break，匹配成功後不會自動向下執行其他case，而是跳出整個switch, 但是可以使用fallthrough強制執行

測試用例：

package main

import "fmt"

func main() {

    switch {
    case false:
            fmt.Println("The integer was <= 4")
            fallthrough
    case true:
            fmt.Println("The integer was <= 5")
            fallthrough
    case false:
            fmt.Println("The integer was <= 6")
            fallthrough
    case true:
            fmt.Println("The integer was <= 7")
    case false:
            fmt.Println("The integer was <= 8")
            fallthrough
    default:
            fmt.Println("default case")
    }
}

執行結果：

The integer was <= 5

The integer was <= 6

The integer was <= 7