useful when working with nested data structures.

the path defines the way to the array. the given array will be returned

given an array like this:

[
    [
        {
            "firstName": "Gordon",
            "lastName": "Freeman"
        }
   ],
   [
        {
            "firstName": "Eli",
            "lastName": "Vance"
        }
    ]
]

a path of 0 will result in this array:

 [
        {
            "firstName": "Gordon",
            "lastName": "Freeman"
        }
]