function getDeep(o, p2, p3, p4, p5) {
    if (p5 !== undefined) {
        if (o.hasOwnProperty(p2) && o[p2].hasOwnProperty(p3) && o[p2][p3].hasOwnProperty(p4) && o[p2][p3][p4].hasOwnProperty(p5)) {
            return o[p2][p3][p4][p5];
        }
    } else if (p4 !== undefined) {
        if (o.hasOwnProperty(p2) && o[p2].hasOwnProperty(p3) && o[p2][p3].hasOwnProperty(p4)) {
            return o[p2][p3][p4];
        }
    } else if (p3 !== undefined) {
        if (o.hasOwnProperty(p2) && o[p2].hasOwnProperty(p3)) {
            return o[p2][p3];
        }
    } else if (p2 !== undefined) {
        if (o.hasOwnProperty(p2)) {
            return o[p2];
        }
    } else if (o !== undefined) {
        return o;
    }
}
window.onload = function () {
    var obj = {a:{b:{c:1}}};
    window.console.log(getDeep(obj, 'a', 'b', 'c')); // returns 1;
    window.console.log(getDeep(obj, 'a', 'b', 'd')); // returns undefined;
}

function getDeep() {
    return [].reduce.call(arguments, function(obj, prop) {
        return obj && obj[prop];
    });
}