good good study, day day up!

vendor/gopl.io/ch8/pipeline2/main.go

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+// Copyright © 2016 Alan A. A. Donovan & Brian W. Kernighan.
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+
+// See page 229.
+
+// Pipeline2 demonstrates a finite 3-stage pipeline.
+package main
+
+import "fmt"
+
+//!+
+func main() {
+	naturals := make(chan int)
+	squares := make(chan int)
+
+	// Counter
+	go func() {
+		for x := 0; x < 100; x++ {
+			naturals <- x
+		}
+		close(naturals)
+	}()
+
+	// Squarer
+	go func() {
+		for x := range naturals {
+			squares <- x * x
+		}
+		close(squares)
+	}()
+
+	// Printer (in main goroutine)
+	for x := range squares {
+		fmt.Println(x)
+	}
+}
+
+//!-