23-buff-channel.go

package main

import (  
    "fmt"
    "time"
)

func write(ch chan int) {  
    for i := 0; i < 5; i++ {
        ch <- i
        fmt.Println("successfully wrote", i, "to ch")
    }
    close(ch)
}
func main() {  
    ch := make(chan int, 3)
    go write(ch)
    time.Sleep(2 * time.Second)
    for v := range ch {
        fmt.Println("read value", v,"from ch")
        fmt.Println("current capacity is", cap(ch))
        fmt.Println("current length is", len(ch))
        time.Sleep(2 * time.Second)

    }
}