ok is false if there are no more values to receive and the channel is closed.

    Note: Only the sender should close a channel, never the receiver. Sending on a closed channel will cause a panic.

    range-and-close.go

    1. package main
    3. import (
    4.     "fmt"
    7.     x, y := 0, 1
    8.     for i := 0; i < n; i++ {
    9.         c <- x
    10.         x, y = y, x+y
    11.     }
    12.     close(c)
    14. func main() {
    15.     c := make(chan int, 10)
    16.     go fibonacci(cap(c), c)
    17.     for i := range c {
    18.         fmt.Println(i)
    19. }