added buffed channel

channel/buffed/main.go

@@ -0,0 +1,40 @@
+package main
+
+import (
+	"fmt"
+	"time"
+)
+
+// Compared with unbuffered counterpart, the sender of buffered channel will block when there is no empty slot of the channel,
+// while the receiver will block on the channel when it is empty.
+func main() {
+	ch := make(chan int, 2)
+
+	go func(ch chan int) {
+		for i := 1; i <= 5; i++ {
+			ch <- i
+			fmt.Println("Func goroutine sends data: ", i)
+		}
+		close(ch)
+	}(ch)
+
+	fmt.Println("Main goroutine sleeps 2 seconds")
+	time.Sleep(time.Second * 2)
+
+	fmt.Println("Main goroutine begins receiving data")
+	for d := range ch {
+		fmt.Println("Main goroutine received data:", d)
+	}
+}
+
+// Main goroutine sleeps 2 seconds
+
+// Func goroutine sends data: 1
+// Main goroutine received data: 1
+
+// Func goroutine sends data: 2
+// Main goroutine received data: 2
+
+// Main goroutine begins receiving data
+// Func goroutine sends data: 3
+// Main goroutine received data: 3