byteToReadCloser.go

package main

import (
	"bytes"
	"fmt"
	"io/ioutil"
)

func main() {
	r := ioutil.NopCloser(bytes.NewReader([]byte("hello world"))) // r type is io.ReadCloser
	
	// example to test r
	buf := new(bytes.Buffer)
	buf.ReadFrom(r)
	r.Close()
	s := buf.String()
	fmt.Println(s)
}