将对象数组转换为嵌套形式

Question

我有一个这种形式的对象数组

nnz=[{

    "verb":"has",

     "nouns": "employees"
   },

   {

     "verb":"has",
     "nouns": "managers"
   },

    {

    "verb":"have",
     "nouns": "departments"
   }
]

但我想把它转换成这种形式

[ {

     "verb":"has",
     "nouns": ["employees",  "managers"]
   },

   {
    "verb":"have",
    nouns:["departments"]
  }
]

而且这项工作必须从客户端完成。我在 node.js 工作。我想允许用户针对每个动词选择多个名词，并且当用户针对动词选择名词时，它应该以上述给定形式保存到数组中。我无法弄清楚如何实现这个逻辑。

更新：我们也必须检查动词。现在它变得更加棘手了。

Answer 1

你可以这样做，使用一些 Array 内置函数：

const array = [

  {

    "verb":"has",

     "nouns": "employees"
   },

   {

     "verb":"has",
     "nouns": "managers"
   },

    {

    "verb":"has",
     "nouns": "departments"
   }
]

const aggregated = array.reduce( (arr, el) =>{
  let found = arr.find(ll => ll.verb == el.verb);
  if(found) found.nouns.push(el.nouns);
  else arr.push({verb : el.verb, nouns : [el.nouns] })
  return arr;
}, []);
console.log(aggregated);

Answer 2

首先创建一个使用动词值作为键的临时对象，然后迭代现有数据，将名词推送到该临时对象中的相应数组。

然后将临时对象映射到一个新数组。

nnz = [{
  "verb": "has",
  "nouns": "employees"
}, {
  "verb": "has",
  "nouns": "managers"
}, {
  "verb": "has",
  "nouns": "departments"
}]

var tmp = {};
nnz.forEach(function(item) {
  tmp[item.verb] = tmp[item.verb] || {
    verb: item.verb,
    nouns: []
  };
  tmp[item.verb].nouns.push(item.nouns);
});

var results = Object.keys(tmp).map(function(key) {
  return tmp[key];
});

console.log(results);

Answer 3

根据您的要求尝试这两种方法。我希望它能按预期工作。

第一种方法：

当您知道属性名称时：

var nnz = [{
"verb":"has",
 "nouns": "employees"
   },
   {
 "verb":"has",
 "nouns": "managers"
   },
{
"verb":"has",
 "nouns": "departments"
   }
];

var newObj = {};
var nouns = [];
for (var i in nnz) {
nouns.push(nnz[i].nouns);
newObj.verb = nnz[i].verb;
newObj.nouns = nouns;
}
  
nnz = newObj;

console.log(nnz);

第二种方法：

当您不知道属性名称时：

var nnz = [{
    "verb":"has",
     "nouns": "employees"
   },
   {
     "verb":"has",
     "nouns": "managers"
   },
    {
    "verb":"has",
     "nouns": "departments"
   }
];

var newObj = {};
var nounsArr = [];
for (var i in nnz) {
nounsArr.push(nnz[i][Object.keys(nnz[i])[1]])
nnz[i][Object.keys(nnz[i])[1]] = nounsArr;
var Objlen = Object.keys(nnz[i]).length;
for (var j=0;j<Objlen;j++) {
var objKeys = Object.keys(nnz[i])[j];
newObj[objKeys] = nnz[i][objKeys];
}
}

nnz = newObj;

console.log(nnz);