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We want to connect the people who have knowledge to the people who need it, to bring together people with different perspectives so they can understand each other better, and to empower everyone to share their knowledge.
out
không có buffer, nên khi muốn đẩy item vào channel thì sẽ bị block cho đến khi có routine khác lấy item đó ra xử lý. Cho nên lệnh close(out)
sẽ chỉ close channel khi các item trong channel out
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