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                > 寫代碼實現兩個 goroutine,其中一個產生隨機數并寫入到 go channel 中,另外一個從 channel 中讀取數字并打印到標準輸出。最終輸出五個隨機數。 **解析** 這是一道很簡單的 golang 基礎題目,實現方法也有很多種,一般想答讓面試官滿意的答案還是有幾點注意的地方。 1. `goroutine`在 golang 中式非阻塞的 2. `channel`無緩沖情況下,讀寫都是阻塞的,且可以用`for`循環來讀取數據,當管道關閉后,`for`退出。 3. golang 中有專用的`select case`語法從管道讀取數據。 示例代碼如下: ~~~go func main() { out := make(chan int) wg := sync.WaitGroup{} wg.Add(2) go func() { defer wg.Done() for i := 0; i < 5; i++ { out <- rand.Intn(5) } close(out) }() go func() { defer wg.Done() for i := range out { fmt.Println(i) } }() wg.Wait() } ~~~
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