Go programming example [Channel traversal Channels Range]

In the previous example, we said that for and range provide iteration functions for basic data structures.

We can also use this syntax to iterate over values ​​obtained from a channel.

// range-over-channels.go
package main

import "fmt"

func main() {
    
    

	// 我们将遍历在 `queue` 通道中的两个值。
	queue := make(chan string, 2)
	queue <- "one"
	queue <- "two"
	close(queue)

	// 这个 `range` 迭代从 `queue` 中得到的每个值。因为我们
	// 在前面 `close` 了这个通道，这个迭代会在接收完 2 个值
	// 之后结束。如果我们没有 `close` 它，我们将在这个循环中
	// 继续阻塞执行，等待接收第三个值
	for elem := range queue {
    
    
		fmt.Println(elem)
	}
}

[root@bogon test]# go run range-over-channels.go
one
two
[root@bogon test]# 

This example also allows us to see that a non-empty channel can also be closed, but the remaining values ​​in the channel can still be received.