go-solid-interface-segregation-5dfc2eada33fd7a8f2eebc5c

log.go

// WriteLog writes change log data into the file. 
// A successful writing will return nil. 
// When unable to write, an error will be returned.
func WriteLog(f *os.File, c ChangeLog) error

log_with_interface.go

// WriteLog writes change log data into the file. 
// A successful writing will return nil. 
// When unable to write, an error will be returned.
func WriteLog(f io.ReadWriteCloser, c ChangeLog) error

log_with_write.go

package main

import (
	"io"
	"os"
	"path/filepath"
)

// WriteLog writes change log data into the file.
// A successful writing will return nil.
// When unable to write, an error will be returned.
func WriteLog(f io.Writer, c ChangeLog) error {
	// TODO: Implement Me!
	return nil
}

func main() {
	f, err := os.Create(filepath.Join(os.TempDir(), "change.log"))
	if err != nil {
		panic(err)
	}
	defer f.Close()

	c := ChangeLog{}
	err = WriteLog(f, c)
	if err != nil {
		panic(err)
	}
}

type ChangeLog struct{}

log_with_write_closer.go

// WriteLog writes change log data into the file. 
// A successful writing will return nil. 
// When unable to write, an error will be returned.
func WriteLog(f io.WriteCloser, c ChangeLog) error