检查键是否存在于嵌套对象中

Question

Before any one sais Object.keys , that may not work here. Please read on before voting to close or commenting.

Consider the following object and the value being passed in:

As you can see I have a key, which doesn't exist in this object. But the intention is that the key being passed in might exist some where in this object and if it does I want to return the value of the hide .

So an example would be something like:

// Pseudo code, `object` is the object in the screen shot.
if (object.hasKey('date_of_visit')) {
  return object.find('date_of_visit').hide
}

Everything I have ever found on stack and the webs is "find the key by the value." I do not have the value, I just have a potential key. I have looked at lodash and underscore and a bunch of stack questions but have found nothing.

Any ideas or help would be greatly appreciated. The object nesting should not matter. If I passed in other_cause_of_death I should get back true .

Thoughts?

Edit:

const object = {
  status: {
    cause_of_death: {
      hide: true,
      other_cause_of_death: {
        hide: true
      }
    }
  }
};

Heres a simplified version of the object. Same rules should still apply.

Answer 1

You can use a recursive approach (DFS) to find the object next to your key. If a non-null object is returned, you can get its hide value:

 const data = { status: { cause_of_death: { hide: true, other_cause_of_death: { hide: true } }, date_of_birth: { hide: true } } }; function findKey(obj, key) { if (typeof obj !== 'object') return null; if (key in obj) return obj[key]; for (var k in obj) { var found = findKey(obj[k], key); if (found) return found; } return null; } console.log(findKey(data, 'date_of_birth')); console.log(findKey(data, 'cause_of_death')); console.log(findKey(data, 'other_cause_of_death')); console.log(findKey(data, 'hello')); 

Answer 2

Since you're working with some structured data this could be a valid approach:

It follows the Immutable.js approach to how getting stuff from immutable maps works.

This will return undefined for an invalid key path.

function getIn(obj, keyPath) {
  return keyPath.reduce((prev, curr) => {
    return Object.keys(prev).length ? prev[curr] : obj[curr];
  }, {});
}

const res = getIn(
    data, ['status', 'cause_of_death', 'other_cause_of_death', 'hide']
);