Javascript通过互值减少对象数组

如何解决Javascript通过互值减少对象数组

如何将对象数组减少到新的合并对象数组？ 我将以下数组与地方及其子区域混合在一起。我想将 sub_main_places 添加到 main_places，如下所示：

 "unformatted places": [
    {
      "name": "main_place1","address": "place_address1"
    },{
      "name": "main_place2","address": "place_address2"
    },{
      "name":"sub_main_place1","address":"sub_main_place_address1"
    },{
      "name":"sub_main_place2","address":"sub_main_place_address2"
    }
  ]

我想要达到的结果是：

  "formatted places": [
    {
      "name": "main_place1","address": "place_address1","sub_area": "sub_main_place1"
    },"address": "place_address2","sub_area": "sub__main_place2"
    }
  ],

解决方法

使用reduce，你可以用与主地址对应的键组合一个对象，然后在遇到子地址时引用这些键。最后，您可以将结果转换回带有 Object.values

的数组

let unformatted_places = [{
    "name": "main_place1","address": "place_address1"
  },{
    "name": "main_place2","address": "place_address2"
  },{
    "name": "sub_main_place1","address": "sub_main_place_address1"
  },{
    "name": "sub_main_place2","address": "sub_main_place_address2"
  }
]

let formatted_places = Object.values(unformatted_places
  .sort((a,b) => a.name.localeCompare(b.name))
  .reduce((b,a) => {
    let f = a.name.split('sub_')[1]
    if (a.name.indexOf('sub_') === 0 && b[f]) {
      b[f].sub_area = a.name;
    } else {
      b[a.name] = a;
    }
    return b;
  },{}))

console.log(formatted_places);

,

尝试了另一种方式：

let data_1 = {
  "unformatted places": [{
      "name": "main_place1","address": "place_address1"
    },{
      "name": "main_place2","address": "place_address2"
    },{
      "name": "sub_main_place1","address": "sub_main_place_address1"
    },{
      "name": "sub_main_place2","address": "sub_main_place_address2"
    }
  ]
};

let data_2 = {}

data_1["unformatted places"].forEach(function(dict) {
  var name = dict.name;
  if (name.startsWith("main")) {
    data_2[name] = dict;
  } else if (name.startsWith("sub_")) {
    let key = name.substring(4,name.length);

    if (key in data_2) {
      data_2[key]["sub_area"] = name;
    } else {
      data_2[key] = {
        "sub_area": name
      };
    }

  }
});
data_2 = {
  "formatted places": Object.values(data_2)
}
console.log(data_2);