get nested property of object

Function that allows to get nested property of object. If it is not defined, function will return undefined.

var getProperty = function(obj, propertySrc) {
    var src = propertySrc.split('.');
    var res = obj;

    for (var i = 0, l = src.length; i < l; ++i) {
        if (!(src[i] in res)) {
            return void(0);
        }
        res = res[src[i]];
    }
    return res;
};

Working example: http://jsfiddle.net/gkucmierz/5Df5D/