How to Find Objects in Nested Arrays by Key Using Recursion?

Finding Objects in Nested Arrays by Key

When working with complex nested data structures, it's often necessary to locate a specific object based on a key. This can be challenging, especially when the data is deeply nested.

Recursion to the Rescue

Recursion allows us to navigate through nested data by breaking it down into smaller, manageable chunks. Here's a recursive function that can find an object with a given key:

function getObject(theObject) {
    var result = null;
    if (theObject instanceof Array) {
        for (var i = 0; i < theObject.length; i++) {
            result = getObject(theObject[i]);
            if (result) {
                break;
            }
        }
    } else {
        for (var prop in theObject) {
            if (prop == 'id') {
                if (theObject[prop] == 1) {
                    return theObject;
                }
            }
            if (theObject[prop] instanceof Object || theObject[prop] instanceof Array) {
                result = getObject(theObject[prop]);
                if (result) {
                    break;
                }
            }
        }
    }
    return result;
}

Usage Example

Let's use this function to find the object where id is 1 in the example nested array:

var myArray = [{
    'title': "some title",
    'channel_id': '123we',
    'options': [{
        'channel_id': 'abc',
        'image': 'http://asdasd.com/all-inclusive-block-img.jpg',
        'title': 'All-Inclusive',
        'options': [{
            'channel_id': 'dsa2',
            'title': 'Some Recommends',
            'options': [{
                'image': 'http://www.asdasd.com',
                'title': 'Sandals',
                'id': '1',
                'content': {
                    // ...
                }
            }]
        }]
    }]
}];

var result = getObject(myArray);
console.log(result); // prints the found object

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