Firebase: getting value of a child without knowing it's key : How can I get the value of a child element without knowing the key of that child element? Example data structure below;

    ->cars
    -->3282jasjd893j: doors
    -->819idid82jkdf: windows
    -->fjf842jr8448r: audi

I need to get the values "doors", "windows", "audi", without knowing the keys.

Any advice will be greatly appreciated!