How do I ignore a missing variable in JSON with javascript?

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Javascript

Groovy

JSON

Hello everyone, good morning.

First of all, i am a begginer to this subjects and English is not my native language.

Thx for the help.

I am developing a test script in javascript which gets values from a JSON response.

See the example below:

HTTP/1.1 200 OK
Content-Type: application/vnd.api+json

{
    "data": [{
        "type": "articles",
        "id": "1",
        "attributes": {
            "title": "JSON API paints my bikeshed!",
            "body": "The shortest article. Ever.",
            "created": "2015-05-22T14:56:29.000Z",
            "updated": "2015-05-22T14:56:28.000Z"
        },
        "relationships": {
            "author": {
                "data": {"id": "42", "type": "people"}
            }
        }
    }],
    "included": [
    {
        "type": "people",
        "id": "42",
        "attributes": {
            "name": "John",
            "age": 80,
            "gender": "male"
        }
    }
    ]
}

However, for some reason, some variables that should come in my JSON script are missing and for that reason my assertions are failing. (imagine for example that i will assert the gender from the response with the expected gender, but the response gender is missing as if the code didn`t even had gender from the start).

I believe it happens because the gender camp is optional.

In JAVA/groovy i know that i could use ? to ignore the missing variables... How can i do the same in javascript.

What I have tried:

i am trying with If/Else, but i`ve failed. Anyway i want to use a shorter solution and more optimized to solve that problem. The closer i get from ? the better,