Golang中多个if代码优化小技巧

if record.City.Names["zh-CN"] == "" {
	city = record.City.Names["en"]
	if record.City.Names["en"] == "" {
		city = record.City.Names["en"]
	}
} else {
	city = "未知地域"
}

if name, ok := record.City.Names["zh-CN"]; ok {
	city = name
} else if city, ok = record.City.Names["en"]; ok {
	city = record.City.Names["en"]
} else {
	city = "未知地域"
}

city = "未知地域"
if name, ok := record.City.Names["zh-CN"]; ok {
	city = name
} else if name, ok = record.City.Names["en"]; ok {
	city = name
}

func calculateGrade(score int) string {
	var grade string
	if score >= 90 && score <= 100 {
		grade = "A"
	} else if score >= 80 && score < 90 {
		grade = "B"
	} else if score >= 70 && score < 80 {
		grade = "C"
	} else if score >= 60 && score < 70 {
		grade = "D"
	} else if score >= 0 && score < 60 {
		grade = "F"
	} else {
		grade = "Invalid Score"
	}
	return grade
}

func calculateGrade(score int) string {
	var grade string
	switch {
	case score >= 90 && score <= 100:
		grade = "A"
	case score >= 80 && score < 90:
		grade = "B"
	case score >= 70 && score < 80:
		grade = "C"
	case score >= 60 && score < 70:
		grade = "D"
	case score >= 0 && score < 60:
		grade = "F"
	default:
		grade = "Invalid Score"
	}
	return grade
}

resp, err := cli.Put(ctx, "", "")
if err != nil {
	switch err {
	case context.Canceled:
		log.Fatalf("ctx is canceled by another routine: %v", err)
	case context.DeadlineExceeded:
		log.Fatalf("ctx is attached with a deadline is exceeded: %v", err)
	case rpctypes.ErrEmptyKey:
		log.Fatalf("client-side error: %v", err)
	default:
		log.Fatalf("bad cluster endpoints, which are not etcd servers: %v", err)
	}
}

resp, err := cli.Put(ctx, "", "")
if err2 != nil {
		switch {
		case errors.Is(err, context.Canceled):
			log.Fatalf("ctx is canceled by another routine: %v", err)
		case errors.Is(err, context.DeadlineExceeded):
			log.Fatalf("ctx is attached with a deadline is exceeded: %v", err)
		case errors.Is(err, rpctypes.ErrEmptyKey):
			log.Fatalf("client-side error: %v", err)
		default:
			log.Fatalf("bad cluster endpoints, which are not etcd servers: %v", err)
		}
	}