Traverse path for javascript

For @windley

var isObject = function isObject(object) {
	return Object.prototype.toString.call(object) === "[object Object]";
};

var isArray = function isObject(object) {
	return Object.prototype.toString.call(object) === "[object Array]";
};

var dashP = function dashP(path, object) {
	var current = object;
	var paths = path.split(".");
	for(var i = 0; i < paths.length; i++ ) {
		var path = paths[i];
		if(isObject(current[path])){
			current = current[path];
		} else {
			if(typeof current[path] === "undefined") {
				current[path] = {};
				current = current[path];
			} else {
				throw new Error("Path specified was not an object or undefined");
			}
		}
	}

	return object;
};

dashP("foo.bar.bazz", {});