[Go] Closing channels.

package main

import "fmt"

func main() {
    ch := make(chan int, 4)
    ch <- 2
    ch <- 4
    close(ch)
    // ch <- 6 // panic, send on closed channel

    fmt.Println(<-ch)
    fmt.Println(<-ch)
    fmt.Println(<-ch) // closed, returns zero value for element
}