Question

如何更紧凑地编写此块？我认为编写这么简单的代码需要很多代码。

// GetSegments Retrieve segments near given coordinate.
func GetSegments(w http.ResponseWriter, r *http.Request) {
  near := r.FormValue("near")
  givenCoordinate := strings.Split(near, ",")

  lat, _ := strconv.ParseFloat(givenCoordinate[0], 32)
  lon, _ := strconv.ParseFloat(givenCoordinate[1], 32)

  lat32 := float32(lat)
  lon32 := float32(lon)

  coord := Coordinate{
      Latitude:  lat32,
      Longitude: lon32}

  fmt.Println(coord)
}

此代码块通过Web API调用： http://localhost:8080/segments?near=14.52872,52.21244

我真的很喜欢Go，但这是我想知道我是否正确使用它的事情之一..

Answer 1

最重要的是，您编写的代码可以生成有效错误消息的正确结果。检查错误。例如，

type Coordinate struct {
    Latitude  float32
    Longitude float32
}

// GetSegments Retrieve segments near given coordinate.
// http://localhost:8080/segments?near=14.52872,52.21244
func GetSegments(w http.ResponseWriter, r *http.Request) (Coordinate, error) {
    const fnc = "GetSegments"
    near := r.FormValue("near")
    if len(near) == 0 {
        return Coordinate{}, fmt.Errorf("%s: near coordinates missing", fnc)
    }
    latlon := strings.Split(near, ",")
    if len(latlon) != 2 {
        return Coordinate{}, fmt.Errorf("%s: near coordinates error: %s", fnc, near)
    }
    lat, err := strconv.ParseFloat(latlon[0], 32)
    if err != nil {
        return Coordinate{}, fmt.Errorf("%s: near latitude: %s: %s", fnc, latlon[0], err)
    }
    lon, err := strconv.ParseFloat(latlon[1], 32)
    if err != nil {
        return Coordinate{}, fmt.Errorf("%s: near longitude: %s: %s", fnc, latlon[1], err)
    }
    coord := Coordinate{
        Latitude:  float32(lat),
        Longitude: float32(lon),
    }
    fmt.Println(coord)
    return coord, nil
}

如何更有效/紧凑地编写此（详细）Golang代码？

1 个答案: