How to access the next nested property of an object in JavaScript

I've been working on a function to retrieve another property key from within the same object.

Consider this example JSON:

'Test123': {
    'Another Test': {},
    'Test some more': {
        'Still testing?': {
            'Yeah...': {}
        },
        'Never ending story': {}
    }
},

For instance, if we input the key 'Still testing?' into the function, it should return 'Yeah...', but if we input 'Yeah...', it should return 'Never ending story'. Does anyone know how to achieve this? I've been attempting to write such a function, but my brain just isn't cooperating...

javascriptjsonloopsself-reference

Answer №1

let data = {
    'Test123': {
        'Another Test': {},
        'Test some more': {
            'Still testing?': {
                'Yeah...': {}
            },
            'Never ending story': {}
        }
    }
}

function findNextKey(lookup, object) {
    if (!lookup || !object || typeof object != 'object' || object.constructor.name != 'Object') {
        console.log("Invalid Input!")
        return
    }
    let isFound = false
    let response = {}
    extractKey(object)

    function extractKey(dataObj) {
        for (let key of Object.keys(dataObj)) {
            if(Object.keys(response).length) return;
            let value = dataObj[key]
            if(key == lookup) isFound = true;
            else if(isFound) {response.key = key; response.value = value; return}
            if (Object.keys(value).length) extractKey(value)
        }
    }

    return (Object.keys(response).length) ? response : "";
}

console.log(findNextKey('Still testing?', data))     //{ key: 'Yeah...', value: {} }
console.log(findNextKey('Yeah...', data))            //{ key: 'Never ending story', value: {} }

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