buffered-channel-sample.go

package main
  
import (
    "fmt"
    "time"
)
  
func write(ch chan int) {
    for i := 0; i < 4; i++ {
        ch <- i
        fmt.Println("successfully wrote", i, "to ch")
    }
    close(ch)
}
func main() {
  
    // creates capacity of 2
    ch := make(chan int, 2)
    go write(ch)
    time.Sleep(2 * time.Second)
    for v := range ch {
        fmt.Println("read value", v, "from ch")
        time.Sleep(2 * time.Second)
  
    }
}

Output

successfully wrote 0 to ch
successfully wrote 1 to ch
read value 0 from ch
successfully wrote 2 to ch
read value 1 from ch
successfully wrote 3 to ch
read value 2 from ch
read value 3 from ch