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Accepted
modelfak
Asked:2020-04-21 00:15:31 +0000 UTC2020-04-21 00:15:31 +0000 UTC

将多个数组合并为一个javascript

  • 772

三个数组有重复的_idkey，需要合并或者合并为一个，这样key就没有重复了_id。

var arr1 = [
  {
    '_id': '1',
    'man': 20
  },
  {
    '_id': '2',
    'man': 15
  }
]


var arr2 = [
  {
    '_id': '1',
    'woman': 13
  },
  {
    '_id': '2',
    'woman': 18
  }
]

var arr3 = [
  {
    '_id': '1',
    'animal': 2
  },
  {
    '_id': '2',
    'animal': 8
  }
]

结果你需要这样的东西

[
   {
    '_id': '1',
    'woman': 13
    'man': 20
    'animal': 2
  },
  {
    '_id': '2',
    'woman': 18
    'man': 15
    'animal': 8
  }
]

如何在一个循环中高效地进行数组连接？或者也许有一种特殊的 lodash 方法？

javascript

2 个回答

  1. Best Answer

    var arr1 = [{ _id: '1', man: 20 }, { _id: '2', man: 15 }]
  , arr2 = [{ _id: '1', woman: 13 }, { _id: '2', woman: 18 }]
  , arr3 = [{ _id: '1', animal: 2 }, { _id: '2', animal: 8 }];

var id = '_id'
  , data = {};
[].concat(arr1, arr2, arr3).forEach(function(item) {
  if (id in item) {
    var key = item[id];
    data[key] = data[key] || {};
    Object.keys(item).forEach(function(property) {
      data[key][property] = item[property];
    });
  }    
});
var result = Object.values(data);
console.log(result);

    • 1 

  2. var arr1 = [{'_id': '1','man': 20}, {'_id': '2','man': 15}];
var arr2 = [{'_id': '1','woman': 13}, {'_id': '2','woman': 18}];
var arr3 = [{'_id': '1','animal': 2}, {'_id': '2','animal': 8}];

var merged = Object.create(null);

arr1.concat(arr2, arr3).forEach(function (obj) {
    merged[obj._id] = Object.assign(merged[obj._id] || {}, obj);
});

console.log(merged);
// Если нужен именно массив
console.log(Object.values(merged));

    • 0

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