javascript - 使用 Lodash groupby 和 map 转换对象数组

Question

这就是我想做的，我想把下面的数组变成它后面的数组。谁能指出我正确的方向？

原始数据

[{
        "FeatureId": 1,
        "District": "ANE",
        "Temperature": 206,
        "RelativeHumidity": 20,
        "WindSpeed": 5,
        "WindGust": 15
      },
      {
        "FeatureId": 1,
        "District": "ANE",
        "Temperature": 196,
        "RelativeHumidity": 19,
        "WindSpeed": 5,
        "WindGust": 15
      },
      {
        "FeatureId": 2,
        "District": "AMO",
        "Temperature": 203,
        "RelativeHumidity": 54,
        "WindSpeed": 9,
        "WindGust": 18
      },
      {
        "FeatureId": 2,
        "District": "AMO",
        "Temperature": 184,
        "RelativeHumidity": 46,
        "WindSpeed": 12,
        "WindGust": 18
      }]

我想要的数据:

[
  {
    "FeatureId": 1,
    "District": "ANE",
    "TemperatureTrend": [ 206, 196 ],
    "RelativeHumidityTrend": [ 20, 19 ],
    "WindSpeedTrend": [ 5, 5 ],
    "WindGustTrend": [ 15, 15 ]
  },
  {
    "FeatureId": 2,
    "District": "AMO",
    "TemperatureTrend": [ 203, 184 ],
    "RelativeHumidityTrend": [ 54, 46 ],
    "WindSpeedTrend": [ 9, 12 ],
    "WindGustTrend": [ 18, 18 ]
  },

]

我试过组合 groupby 和 map，但无法解决问题。我也不确定如何记录这些步骤。

Answer 1

除了其他好的答案，您还可以使用 es6 解构。

var arr = [{
            "FeatureId": 1,
            "District": "ANE",
            "Temperature": 206,
            "RelativeHumidity": 20,
            "WindSpeed": 5,
            "WindGust": 15
          },
          {
            "FeatureId": 1,
            "District": "ANE",
            "Temperature": 196,
            "RelativeHumidity": 19,
            "WindSpeed": 5,
            "WindGust": 15
          },
          {
            "FeatureId": 2,
            "District": "AMO",
            "Temperature": 203,
            "RelativeHumidity": 54,
            "WindSpeed": 9,
            "WindGust": 18
          },
          {
            "FeatureId": 2,
            "District": "AMO",
            "Temperature": 184,
            "RelativeHumidity": 46,
            "WindSpeed": 12,
            "WindGust": 18
          }]

var temp = arr.reduce((o, d) => (
              { WindSpeed, WindGust, RelativeHumidity, Temperature, ...rest } =
                    ({ 
                       ...d
    		      , ...{ 
		          RelativeHumidityTrend:  (o[d.FeatureId] && o[d.FeatureId].RelativeHumidityTrend || []).concat(d.RelativeHumidity)
		       	  , WindSpeedTrend:  (o[d.FeatureId] && o[d.FeatureId].WindSpeedTrend || []).concat(d.WindSpeed)
     	       		  , WindGustTrend:  (o[d.FeatureId] && o[d.FeatureId].WindGustTrend || []).concat(d.WindGust) 
                          , TemperatureTrend:  (o[d.FeatureId] && o[d.FeatureId].TemperatureTrend || []).concat(d.Temperature)
			}
    		})
    	        , o[d.FeatureId] = rest
   	        , o
    	   ) , {})
              
    var result = Object.values(temp)
    console.log(result)