javascript - 如何将多个对象的值合并到一个数组对象中？

Question

我有两个 JSON，如下所示:

var obj1 = {
    " name ":"rencho",
    " age ":23,
    " occupation ":"SE"
}

var obj2 = {
    " name ":"manu",
    " age ":23,
    " country ":"india"
}

我想要预期的输出:

var result = {
    "name":["rencho", "manu"],
    "age":[23, 23],
    "country":["-", "india"],
    "occupation": ["SE", "-"],
}

但是，我尝试使用下面的代码片段:

let arrGlobal = []

arrGlobal.push(obj1);
arrGlobal.push(obj2);

let mergedResult = arrGlobal.reduce(function(r, e) {
            return Object.keys(e).forEach(function(k) {
            if(!r[k]) r[k] = [].concat(e[k])
            else r[k] = r[k].concat(e[k])
            }), r
        }, {})

console.log(mergedResult);

但是那个不在 json 对象中打印 - 。如果您能提供任何形式的帮助，我将不胜感激。

不胜感激!!!

Answer 1

首先获取所有键的列表(需要提前检查是否需要在迭代时添加-)，然后使用reduce遍历每个对象并添加它对累加器的值:

var obj1 = {
    " name ":"rencho",
    " age ":23,
    " occupation ":"SE"
}

var obj2 = {
    " name ":"manu",
    " age ":23,
    " country ":"india"
}
const arr = [obj1, obj2];
const allKeys = arr.reduce((keys, obj) => {
  Object.keys(obj).forEach(key => keys.add(key))
  return keys;
}, new Set());
const merged = arr.reduce((merged, obj) => {
  allKeys.forEach((key) => {
    if (!merged[key]) merged[key] = [];
    merged[key].push(obj[key] || '-');
  });
  return merged;
}, {});
console.log(merged);