javascript - 反向填充对象

Question

所以我正在尝试构建重建对象并以受人尊敬的方式返回的函数，例如:

当前对象:

{
    "child1": {
        "value": "firstvalue", "Key": "ID1"
    },
    "child2":
    {
        "value": "secondvalue", "Key": "ID2"
    },
    "child3":
    {
        "value": "thirdvalue", "Key": "ID1"
    },
}

预期对象:

{
    "ID1": {
        "child1": "first value",
        "child3": "third value", 
    },
    "ID2": {
        "child2": "third value",
    },
}

有什么干净的方法可以做到吗？或者我必须将它插入数组？我尝试将其插入数组，然后组织它，但每当我尝试插入具有相同“ID1”的对象时，它都会替换它，尝试使用reduce和concat到数组中，但仍然没有弄清楚，谢谢您的帮助!

Answer 1

是的，这很有可能:

const obj = {
    "child1": {
        "value": "firstvalue", "Key": "ID1"
    },
    "child2":
    {
        "value": "secondvalue", "Key": "ID2"
    },
    "child3":
    {
        "value": "thirdvalue", "Key": "ID1"
    },
};

const result = Object.entries(obj) // Get all key/value pairs in the source object.
  .reduce((result, [child, data]) => {
    result[data.Key] = result[data.Key] || {}; // Make sure result[data.Key] is an object.
    result[data.Key][child] = data.value;      // Assign the current entry's value to object.
    return result;
  }, {});
    
console.log(result)