transform.Stringを使う方法がネットで記載が少なかったので記載。
func Utf8ToSjis(str string) (string, error) {
sjisEnc := japanese.ShiftJIS.NewEncoder()
sjisStr, _, err := transform.String(sjisEnc, str)
if err != nil {
return "", err
}
return sjisStr, nil
}
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