lodash .groupBy。 如何为分组输出添加自己的密钥？

Question

[{
    "car_brand": "audi",
    "model": {
      "model_1": "audi_tt"
    }

  },
  {
    "car_brand": "audi",
    "model": {
      "model_1": "audi_r8"
    }
  }
]

anyways convert to as be

[{
  "car_brand": "audi",
  "model": [{
      "model_1": "audi_tt"
    },
    {
      "model_1": "audi_r8"
    }
  ]
}]

Answer 1

You can first use _.groupBy() to group each object, and then _.map() each group in the object to an array of objects. Each mapped object uses the key from the grouped object as the car_brand , as well as uses a mapped version of the grouped value array as the model property:

 const arr = [{ "car_brand": "audi", "model": { "model_1": "audi_tt" } }, { "car_brand": "audi", "model": { "model_1": "audi_r8" } } ]; const group = _.flow( inp => _.groupBy(inp, 'car_brand'), gr => _.map(gr, (arr, card_brand) => ({ card_brand, model: _.map(arr, 'model') })) ); console.log(group(arr));

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