javascript - 在数组json中的单个对象中转换多个相同的键对象

Question

我在下面有这个 json:

[
  {"animal": "cat"},
  {"animal": "dog"},
  {"animal": "elephant"},
  {"vehicle": "car"},
  {"vehicle": "bike"},
  {"vehicle": "truck"},
  {"toys": "a1"},
  {"toys": "a2"},
  {"toys": "a3"}
]

我预期的 json 响应是:

[
  {"animal": "cat", "vechile": "car", "toys": "a1"},
  {"animal": "dog", "vechile": "bike", "toys": "a2"},
  {"animal": "elephant", "vechile": "truck", "toys": "a3"}
]

我尝试了以下程序，但没有给我预期的输出，我想制作一个数组，以便我可以比较它并相应地添加:

var myGlobalArr = []
var globalObject = {}

for (var i = 0; i < mainArr.length; i++)
{
    if (Object.keys(mainArr[i])[0] == Object.keys(myGlobalArr[i])[0])
    {
        globalObject[Object.keys(mainArr[i])[0]] = globalObject[Object.values(mainArr[i])[0]]
    }
}

console.log(myGlobalArr)

不胜感激!!

#EDITED:

它将是 3 的 block 。

Answer 1

您可以使用 Array.reduce() 执行此操作.在 reduce 的每次迭代中，您可以检查最终数组的哪个索引使用对象的当前索引 modulus 3 (idx % 3):

const input = [
  {"animal": "cat"},
  {"animal": "dog"},
  {"animal": "elephant"},
  {"vehicle": "car"},
  {"vehicle": "bike"},
  {"vehicle": "truck"},
  {"toys": "a1"},
  {"toys": "a2"},
  {"toys": "a3"}
];

let res = input.reduce((acc, curr, idx) =>
{
    let [[k, v]] = Object.entries(curr);
    acc[idx % 3] = acc[idx % 3] || {};
    acc[idx % 3][k] = v;
    return acc;
}, [])

console.log(res);

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