我们如何从具有名称 ID 但具有特定父对象的 JSON 中获取所有属性值

Question

I have a JSOn with multiple id value and I need to get an array out of all id values with parent 'parent4'

I did this and it returns me all id values in an array

function findAllByKey(obj, keyToFind) {
    return Object.entries(obj).reduce(
      (acc, [key, value]) =>
        key === keyToFind
          ? acc.concat(value)
          : typeof value === "object"
          ? acc.concat(findAllByKey(value, keyToFind))
          : acc,
      []
    );
  }

But I just need those IDs with parent 'parent4' My output should be ['this is needed1', 'this is needed2', 'this is needed3', 'this is needed4']

Here is the codesandbox link

https://codesandbox.io/s/determined-noyce-0jgzj0?file=/src/App.js

Answer 1

I'm mostly making use of your own code here.
First look for the parents you need:

const resultParent = findAllByKey(myObj, "parent4");

Then input the result and get the ids you are looking for:

const result = findAllByKey(resultParent, "@id");

And then:
console.log(result) will output: ["this is needed1", "this is needed2", "this is needed3", "this is needed4"]