What is the best way to locate a specific item within an array of objects, especially when each object has the potential to contain an array of objects of the

I am grappling with the challenge of finding a specific object within an array of objects, where the desired object may be nested within another array of one of the objects.

I have experimented with various iterations of forEach loops and recursion methods.

{
    "id": 1,
    "messages": [{
            "id": 4,
            "message": "XXXXXXXX",
            "code": "XXXXXX",
            "subMessages": null
        }, {
            "id": 8,
            "message": "XXXXXXXX",
            "code": "XXXXXX",
            "subMessages": [{
                    "id": 9,
                    "message": "XXXXXXXX",
                    "code": "XXXXXX",
                    "subMessages": null
                }
            ]
        }, {
            "id": 10,
            "message": "XXXXXXXX",
            "code": "XXXXXX",
            "subMessages": [{
                    "id": 11,
                    "message": "XXXXXXXX",
                    "code": "XXXXXX",
                    "subMessages": [{
                            "id": 12,
                            "message": "XXXXXXXX",
                            "code": "XXXXXX",
                            "subMessages": null
                        }
                    ]
                }
            ]
        }
    ]
}

The depth of nesting is uncertain and may exceed that shown in the example, and the arrays may contain multiple messages each. My objective is to locate a message based on its unique ID (IDs are unique across all messages).

Any suggestions?

javascriptarrays

Answer №1

Based on your explanation, it seems like your goal is to retrieve the message associated with a specific id.

If you require the entire message object, you can modify the line of code from `returnData = messageObj.message;` to `returnData = messageObj;`

I opted for using array.some instead of a for loop to accomplish this task


var messagesData = {
  "id": 1,
  "messages": [{
    "id": 4,
    "message": "4XXXXXXXX",
    "code": "XXXXXX",
    "subMessages": null
  }, {
    "id": 8,
    "message": "8XXXXXXXX",
    "code": "XXXXXX",
    "subMessages": [{
      "id": 9,
      "message": "9XXXXXXXX",
      "code": "XXXXXX",
      "subMessages": null
    }]
  }, {
    "id": 10,
    "message": "10XXXXXXXX",
    "code": "XXXXXX",
    "subMessages": [{
      "id": 11,
      "message": "11XXXXXXXX",
      "code": "XXXXXX",
      "subMessages": [{
        "id": 12,
        "message": "12XXXXXXXX",
        "code": "XXXXXX",
        "subMessages": null
      }]
    }]
  }]
};


function getMessageById(id) {
  var returnData;

  function searchForMessage(messages) {
    messages.some(function(messageObj) {
      if (messageObj.id === id) {
        returnData = messageObj.message;
        return true;
      } else if (messageObj.subMessages && messageObj.subMessages.length) {
        return searchForMessage(messageObj.subMessages);
      } else {
        return false;
      }
    });
  }
  searchForMessage(messagesData.messages);
  return returnData;
}

console.log(getMessageById(11));
console.log(getMessageById(4));
console.log(getMessageById(12));

You can view the code on my jsfiddle link here - https://jsfiddle.net/karthikeyan_shanmugavadivelan/3o0udv7f/11/

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