How can i check if the child object has the id inside it?

I have seller and buyer information inside an array, i need to check if the id matches with either seller or buyer id inside the array, then i need to remove the object from the array.

here is the array:

[
  {
    "transactionId": null,
    "buyer": {
      "userId": "eu-central-1",
      "email": "pic@gmail.com",
      "firstName": "pic",
      "lastName": "1",
      "_id": "5902ca3ce201550655a7bbf8"
    },
    "seller": {
      "userId": "eu-central-2",
      "email": "pic2@gmail.com",
      "firstName": "pic",
      "lastName": "2",
      "_id": "5902ca3ce201550655a7bbf7"
    }
  }
]

i have the userid eu-central-2. i want the expected output as,

[
  {
    "transactionId": null,
    "user": {
      "userId": "eu-central-1",
      "email": "pic@gmail.com",
      "firstName": "pic",
      "lastName": "1",
      "_id": "5902ca3ce201550655a7bbf8"
    } 
  }
]

what i tried

  let data = results.filter(result=> seller.userId || buyer.userId == userId);

via face turn