Golang - File Creating and Reading.go

package main

import (
	"bufio"
	"fmt"
	"io"
	"os"
)

func main() {
	// file name
	fileName := "newFile.txt"

	if _, err := os.Stat(fileName); os.IsNotExist(err) {
		// create a file
		_, err := os.Create(fileName)
		checkError(err)
		fmt.Println(fileName + " is created.")
	} else {
		// file exists
		fmt.Println(fileName + " exists.")
	}

	// For read access.
	fileData, err := os.OpenFile(fileName, os.O_WRONLY|os.O_APPEND, 0666)
	checkError(err)

	fileStat, err := os.Stat(fileName)
	checkError(err)

	if fileStat.Size() == 0 {
		fmt.Println("It is fresh!")
	}

	reader := bufio.NewReader(os.Stdin)
	fmt.Print("\nText: ")

	content, _ := reader.ReadString('\n')

	ln, err := io.WriteString(fileData, content)
	checkError(err)
	fmt.Printf("%v character is included.", ln-1)

	fileData.Close()
}

func checkError(err error) {
	if err != nil {
		panic(err)
	}
}