JS Recursive Function

test.js

var home = {
    room_1: {
        tube: 5,
        fan: 6,
        lamp: {
            one: 7,
            two: {
                two_1: 8,
                tow_two: 9
            }
        }
    }
};

var a = [];

var recursive_setup = function(start) {
    var b = [];
    if (typeof start !== "object") {
       a.push(start);
    } else {
        for (i in start) {
            b.push(recursive_setup(start[i]));
        }
    }
    
    return a;
};

console.log(recursive_setup(home));