// Sample program to show how a bytes.Buffer can also be used

// with the io.Copy function.

package main

import (

    "bytes"

    "fmt"

    "io"

    "os"

)

// main is the entry point for the application.

func main() {

    var b bytes.Buffer

    // Write a string to the buffer.

    b.Write([]byte("Hello"))

    // Use Fprintf to concatenate a string to the Buffer.

    fmt.Fprintf(&b, " World!\n")

    // Write the content of the Buffer to stdout.

    io.Copy(os.Stdout, &b)

}

Hello World!