在Go中为IO操作添加助手是不好的做法吗?

Question

我来自c#背景，使用System.IO命名空间的File.ReadAllLines和File.WriteAllLines等IO方法。我有点惊讶地发现Go并没有为这些IO操作提供方便的函数。为了避免代码重复，我编写了以下帮助程序。有什么理由不这么做吗?

// WriteBytes writes the passed in bytes to the specified file. Before writing,
// if the file already exists, deletes all of its content; otherwise, creates
// the file.
func WriteBytes(filepath string, bytes []byte) (err error) {
file, err := os.Create(filepath)
if err != nil {
return err
}
defer closeWithErrorPropagation(file, &err)
_, err = file.Write(bytes)
if err != nil {
return err
}
return err
}
// WriteString writes the passed in sting to the specified file. Before writing,
// if the file already exists, deletes all of its content; otherwise, creates
// the file.
func WriteString(filepath string, text string) (err error) {
file, err := os.Create(filepath)
if err != nil {
return err
}
defer closeWithErrorPropagation(file, &err)
_, err = file.WriteString(text)
if err != nil {
return err
}
return err
}
// WriteLines writes the passed in lines to the specified file. Before writing,
// if the file already exists, deletes all of its content; otherwise, creates
// the file.
func WriteLines(filepath string, lines []string) (err error) {
file, err := os.Create(filepath)
if err != nil {
return err
}
defer closeWithErrorPropagation(file, &err)
for _, line := range lines {
_, err := file.WriteString(fmt.Sprintln(line))
if err != nil {
return err
}
}
return err
}
func closeWithErrorPropagation(c io.Closer, err *error) {
if closerErr := c.Close(); closerErr != nil && *err == nil { // Only propagate the closer error if there isn't already an earlier error.
*err = closerErr
}
}

Answer 1

WriteFile可以处理WriteBytes和WriteString函数的等效功能:

// func WriteBytes(filepath string, bytes []byte) (err error)
err = os.WriteFile("testdata/hello", []byte("Hello, Gophers!"), 0666)

// func WriteString(filepath string, text string) (err error)
text := "Hello, Gophers!"
err = os.WriteFile("testdata/hello", []byte(text), 0666)

并结合字符串。Join可以处理WriteLines:

//func WriteLines(filepath string, lines []string) (err error)
lines := []string{"hello", "gophers!"}
err = os.WriteFile("testdata/hello", []byte(strings.Join(lines, "n")), 0666)