Golang io.CopyN function example

package io

Golang io.CopyN function usage example

 package main

 import (
 "fmt"
 "io"
 "strings"
 "os"
 )

 func main() {
 reader := strings.NewReader("Hello World!")

 written, err := io.CopyN(os.Stdout, reader, 8) // copy up to 8 bytes

 fmt.Printf("\n%d, %v", written, err)
 }

Output :

Hello Wo

8,

Reference :

http://golang.org/pkg/io/#CopyN