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                # Go Switch語句 當條件判斷分支太多的時候,我們會使用switch語句來優化邏輯。 ```go package main import "fmt" import "time" func main() { // 基礎的switch用法 i := 2 fmt.Print("write ", i, " as ") switch i { case 1: fmt.Println("one") case 2: fmt.Println("two") case 3: fmt.Println("three") } // 你可以使用逗號來在case中分開多個條件。還可以使用default語句, // 當上面的case都沒有滿足的時候執行default所指定的邏輯塊。 switch time.Now().Weekday() { case time.Saturday, time.Sunday: fmt.Println("it's the weekend") default: fmt.Println("it's a weekday") } // 當switch沒有跟表達式的時候,功能和if/else相同,這里我們 // 還可以看到case后面的表達式不一定是常量。 t := time.Now() switch { case t.Hour() < 12: fmt.Println("it's before noon") default: fmt.Println("it's after noon") } } ``` 輸出結果為 ``` write 2 as two it's a weekday it's before noon ```
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