Mastering Go - Second Edition

Receiving from a closed channel

In this subsection, you will learn what happens when you try to read from a closed channel using the Go code found in readClose.go, which is going to be presented in two parts.

The first part of readClose.go is as follows:

package main 
 
import ( 
    "fmt" 
) 
 
func main() { 
    willClose := make(chan int, 10) 
 
    willClose <- -1 
    willClose <- 0 
    willClose <- 2 
 
    <-willClose 
    <-willClose 
    <-willClose 

In this part of the program, we create a new int channel named willClose, we write data to it, and we read all that data without doing anything with it.

The second part of readClose.go contains the following code:

    close(willClose) 
    read := <-willClose 
    fmt.Println(read) 
} 

In this part, we close the willClose channel and we try to read ...