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Nguyễn Hiếu
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Nguyễn HiếuBeginner
Asked: July 8, 20222022-07-08T07:26:23+00:00 2022-07-08T07:26:23+00:00In: Go Lang

[BadQuestionBecauseCodeInImage]Channel trong Go Lang

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Cho em hỏi, mình gửi qua 2 channel, mà tại sao select nó có mấy giá trị 0 vậy ạ, em thấy có gọi hàm close cho mỗi channel sau khi gửi xong rồi mà

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  1. ducnt114 Pundit
    2022-07-08T08:13:26+00:00Added an answer on July 8, 2022 at 8:13 am
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    em gửi full code chương trình lên đây để xem cho dễ nhé, anh nhìn hình thì thấy thiếu đoạn khai báo channel.

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    • Nguyễn Hiếu Beginner
      2022-07-08T08:54:06+00:00Replied to answer on July 8, 2022 at 8:54 am

      dạ em gửi ở phía dưới á anh

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  2. Nguyễn Hiếu Beginner
    2022-07-08T08:53:44+00:00Added an answer on July 8, 2022 at 8:53 am
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    Dạ đạ đây anh ơi

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    • ducnt114 Pundit
      2022-07-08T08:57:58+00:00Replied to answer on July 8, 2022 at 8:57 am

      cái này không liên quan gì đến ảnh ở đầu bài đúng ko em? anh nhìn thì thấy nó khác hoàn toàn.

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      • Nguyễn Hiếu Beginner
        2022-07-08T09:02:03+00:00Replied to answer on July 8, 2022 at 9:02 am

        nó như nhau ấy ạ, em coi video code theo ấy anh, cái trên em cap từ video, cái dưới em code lại, em có sleep trong case để nó in ra chậm lại thôi ạ

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        • ducnt114 Pundit
          2022-07-08T09:09:55+00:00Replied to answer on July 8, 2022 at 9:09 am
          This answer was edited.

          Khi channel bị close thì chỉ không gửi được message mới vào channel thôi, còn vẫn lấy ra được, và giá trị trả về sẽ là zero value theo data type của channel, channel trong bài là chan int nên zero value của int là 0, nếu chan string thì sẽ trả về empty string.

          Nếu muốn check channel close chưa khi nhận message thì em có thể dùng cú pháp:

          msg, ok := <- c
          if !ok {
          // channel closed
          } else {
          // not closed
          fmt.Println(msg)
          }
          
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          • Nguyễn Hiếu Beginner
            2022-07-08T09:19:45+00:00Replied to answer on July 8, 2022 at 9:19 am

            dạ tkss anh
            em có thể hỏi tiếp về chỗ pipeline fade-in dae-out kh ạ

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  3. ducnt114 Pundit
    2022-07-08T09:23:09+00:00Added an answer on July 8, 2022 at 9:23 am

    Em post tiếp câu hỏi thành comment mới cũng được, paste text cho dễ theo dõi, để trong thẻ <pre> ấy

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