获取对象键和父 javascript 的值并创建一个新对象

Question

I have an object that looks like the following:

const testObject = {
  "NameA": {
    "Name": {
      "_text": "Peter"
    }
  },
  "AgeA": {
    "_comment": "line=2",
    "age": {
      "_text": "21"
    }
  },
  "Birth": {
    "_comment": "line=3",
    "Birthday": {
      "DateTimeSignUTCOffset": {
        "Date": {
          "_text": "191201"
        },
        "Time": {
          "_text": "1123"
        },
      },
      "Test": {
        "Code": {
          "_text": "1234"
        }
      },
    }
  }
}

I am trying to find any key with the key _text and get the corresponding value and the parent key.

ie

const result = { 
    "Name": "Peter",
    "age": "21",
    "Date": "191201",
    "Time": "1123",
    "Code": "1234"
};

I have tried the following by looping through the object but am unable to figure it out.

const result = {};

const find_items = (object) => {
  console.log(Object.keys(object));
  Object.keys(object).map((item) => {
    console.log(object[item]);
    if(object[item] !== '_text') {
      find_items(object[item])
    } else {
      console.log(item)
    }
  });
};

find_items(testObject);

console.log(result);

Can someone could point me in the right direction?

Answer 1

You could take a recursive approach and check for object and if _text property exist take the value with the outer key or get the entries from the recursive call with the object.

At the end build an object from all entries.

 const flatEntries = object => Object .entries(object) .flatMap(([k, v]) => { if (v && typeof v === 'object') return '_text' in v ? [[k, v._text]] : flatEntries(v); return []; }); testObject = { NameA: { Name: { _text: "Peter" } }, AgeA: { _comment: "line=2", age: { _text: "21" } }, Birth: { _comment: "line=3", Birthday: { DateTimeSignUTCOffset: { Date: { _text: "191201" }, Time: { _text: "1123" } }, Test: { Code: { _text: "1234" } } } } }, result = Object.fromEntries(flatEntries(testObject)); console.log(result);

Answer 2

in English, what you want to do is:

create an empty object named "result", and then recursively iterate through the "object" object. each time you encounter a key linked to a sub-object which has a __text field, add that to the "result" object.

now just translate the above into JavaScript.

the keyword here is "recursively". your original code was not recursive.

Answer 3

your idea is pretty good, but you want to find _text keys anywhere nested inside the object. To find inner, nested, keys, you need to recurse your function if the value of some key happens to be an object.

result = {}

find_text_keys = (haystack, label) => {
  Object.keys(ob).forEach(key => {
    if (key === '_text') {
      res[text] = ob["_text"];
    } else if (typeof(ob[key]) === "object") {
      find_text_keys(ob[key], key);
    }
  });
}

Then, calling the function with a default label f(object, "default_label") will populate the result dictionary as you desired.