GO chan 编程

package main

import (
	"fmt"
	"math/rand"
	"sync"
)

func main() {

	numberChan1 := make(chan int64, 3)
	numberChan2 := make(chan int64, 3)
	numberChan3 := make(chan int64, 3)

	var waitGroup sync.WaitGroup
	waitGroup.Add(3)

	go func() {
		for n := range numberChan1 {
			if n%2 == 0 {
				numberChan2 <- n
			} else {
				fmt.Printf("Filter %d. [filter 2]\n", n)
			}
		}
		close(numberChan2)
		waitGroup.Done()
	}()

	go func() {
		for n := range numberChan2 {
			if n%5 == 0 {
				numberChan3 <- n
			} else {
				fmt.Printf("Filter %d. [filter 5]\n", n)
			}
		}
		close(numberChan3)
		waitGroup.Done()
	}()

	go func() {
		for n := range numberChan3 {
			fmt.Println("n = ", n)
		}
		waitGroup.Done()
	}()

	for i := 0; i < 100; i++ {
		numberChan1 <- rand.Int63n(100)
	}
	close(numberChan1)

	waitGroup.Wait()
}

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