javascript - 如何将对象转换为按对象键分组

Question

我有这个对象，它还包含数组和对象，并且当前按“类别”分组

data = {
  vehicles: [
    {
      name: "Team1",
      cars: [
        {
          multiple: 0.5,
          category: "cars"
        },
        {
          multiple: 0.5,
          category: "cars"
        }
      ],
      bike: [
        {
          multiple: 0.5,
          category: "bike"
        }
      ],
      scooter: [
        {
          multiple: 0.5,
          category: "scooter"
        }
      ]
    },
    {
      name: "Team2",
      cars: [
        {
          multiple: 0.5,
          category: "cars"
        },
        {
          multiple: 0.5,
          category: "cars"
        }
      ],
      bike: [
        {
          multiple: 0.5,
          category: "bike"
        }
      ],
      scooter: [
        {
          multiple: 0.5,
          category: "scooter"
        }
      ]
    }
  ]
};

我使用这行代码对类别进行分组，但是

  return xs.reduce(function(rv, x) {
    (rv[x[key]] = rv[x[key]] || []).push(x);
    return rv;
  }, {});
};
var data = groupBy(data, "category");

由于我现在有了对象“数据”，所以我想执行进一步的转换我的问题是可以将两个类别分组，这样输出看起来像这样

data = {
  vehicles: [
    {
      name: "Team1",
      cars: [
        {
          multiple: 0.5,
          category: "cars"
        },
        {
          multiple: 0.5,
          category: "cars"
        }
      ],
      bike_scooter: [
        {
          multiple: 0.5,
          category: "bike"
        },
        {
          multiple: 0.5,
          category: "scooter"
        }
      ]
    },
    {
      name: "Team2",
      cars: [
        {
          multiple: 0.5,
          category: "cars"
        },
        {
          multiple: 0.5,
          category: "cars"
        }
      ],
      bike_scooter: [
        {
          multiple: 0.5,
          category: "bike"
        },
        {
          multiple: 0.5,
          category: "scooter"
        }
      ]
    }
  ]
};

Answer 1

您可以使用两个减少方法来完成此操作，一种用于构建车辆数组，另一种用于通过提供的键数组对每个对象进行分组。

const data = {"vehicles":[{"name":"Team1","cars":[{"multiple":0.5,"category":"cars"},{"multiple":0.5,"category":"cars"}],"bike":[{"multiple":0.5,"category":"bike"}],"scooter":[{"multiple":0.5,"category":"scooter"}]},{"name":"Team2","cars":[{"multiple":0.5,"category":"cars"},{"multiple":0.5,"category":"cars"}],"bike":[{"multiple":0.5,"category":"bike"}],"scooter":[{"multiple":0.5,"category":"scooter"}]}]};

function groupBy(data, keys) {
  return data.vehicles.reduce((r, {name,...rest}) => {
    const obj = Object.entries(rest).reduce((a, [k, v]) => {
      if (keys.includes(k)) {
        const key = keys.join('_');
        if (!a[key]) a[key] = [...v];
        else a[key].push(...v);
      } else a[k] = [...v]
      return a
    }, {name})

    r.vehicles.push(obj)
    return r;
  }, {
    vehicles: []
  })
}

console.log(groupBy(data, ['bike', 'scooter']))
console.log(groupBy(data, ['bike', 'cars']))