refactor: Optimize variable declaration and assignment

Author: kuafuRace

helper.go

@@ -107,38 +107,38 @@ func format2layout(format string) string {
 
 // parses a timezone string as a time.Location instance.
 // 将 时区字符串 解析成 time.Location 实例
-func parseTimezone(timezone string) (*Location, error) {
+func parseTimezone(timezone string) (loc *Location, err error) {
 	if timezone == "" {
 		return nil, ErrEmptyTimezone()
 	}
-	loc, err := time.LoadLocation(timezone)
+	loc, err = time.LoadLocation(timezone)
 	if err != nil {
 		err = fmt.Errorf("%w: %w", ErrInvalidTimezone(timezone), err)
 	}
-	return loc, err
+	return
 }
 
 // parses a duration string as a time.Duration instance.
 // 将 时长字符串 解析成 time.Duration 实例
-func parseDuration(duration string) (Duration, error) {
+func parseDuration(duration string) (dur Duration, err error) {
 	if duration == "" {
 		return 0, ErrEmptyDuration()
 	}
-	dur, err := time.ParseDuration(duration)
+	dur, err = time.ParseDuration(duration)
 	if err != nil {
 		err = fmt.Errorf("%w: %w", ErrInvalidDuration(duration), err)
 	}
-	return dur, err
+	return
 }
 
 // parses a timestamp string as a int64 format timestamp.
 // 将 时间戳字符串 解析成 int64 格式时间戳
-func parseTimestamp(timestamp string) (int64, error) {
-	ts, err := strconv.ParseInt(timestamp, 10, 64)
+func parseTimestamp(timestamp string) (ts int64, err error) {
+	ts, err = strconv.ParseInt(timestamp, 10, 64)
 	if err != nil {
 		return 0, fmt.Errorf("%w: %w", ErrInvalidTimestamp(timestamp), err)
 	}
-	return ts, nil
+	return
 }
 
 // gets absolute value.

type_carbon.go

@@ -16,10 +16,10 @@ func (c *Carbon) Scan(src any) error {
 		*c = *Parse(string(v), DefaultTimezone)
 	case string:
 		*c = *Parse(v, DefaultTimezone)
-	case time.Time:
-		*c = *CreateFromStdTime(v, DefaultTimezone)
 	case int64:
 		*c = *CreateFromTimestamp(v, DefaultTimezone)
+	case time.Time:
+		*c = *CreateFromStdTime(v, DefaultTimezone)
 	default:
 		return ErrFailedScan(v)
 	}

type_format.go

@@ -38,10 +38,10 @@ func (t *FormatType[T]) Scan(src any) error {
 		c = Parse(string(v), DefaultTimezone)
 	case string:
 		c = Parse(v, DefaultTimezone)
-	case time.Time:
-		c = CreateFromStdTime(v, DefaultTimezone)
 	case int64:
 		c = CreateFromTimestamp(v, DefaultTimezone)
+	case time.Time:
+		c = CreateFromStdTime(v, DefaultTimezone)
 	default:
 		return ErrFailedScan(v)
 	}

type_layout.go

@@ -38,10 +38,10 @@ func (t *LayoutType[T]) Scan(src any) error {
 		c = Parse(string(v), DefaultTimezone)
 	case string:
 		c = Parse(v, DefaultTimezone)
-	case time.Time:
-		c = CreateFromStdTime(v, DefaultTimezone)
 	case int64:
 		c = CreateFromTimestamp(v, DefaultTimezone)
+	case time.Time:
+		c = CreateFromStdTime(v, DefaultTimezone)
 	default:
 		return ErrFailedScan(v)
 	}