flatten.js

function unflatten(path, obj, value) {
	var key, child, result;

	if (Object.prototype.toString.call(path) == '[object Object]') {
		result = {};
		for (key in path) {
			if (path.hasOwnProperty(key)) {
				unflatten(key.split('.'), result, path[key]);
			}
		}

		return result;
	}

	key = path.shift();

	if (path.length == 0) {
		obj[key] = value;
		return obj;
	}

	if ((child = obj[key]) == void 0) {
		child = obj[key] = {};
	}

	unflatten(path, child, value);

	return obj;
}

function flatten(obj) {
	var result = {}, value, nestedValue, nested;

	for (var key in obj) {
		if (obj.hasOwnProperty(key)) {
			value = obj[key];

			if (Object.prototype.toString.call(value) == '[object Object]') {
				nested = flatten(value);
				for (var nestedKey in nested) {
					if (nested.hasOwnProperty(nestedKey)) {
						nestedValue = nested[nestedKey];
						result[key + "." + nestedKey] = nestedValue;
					}
				}
			} else {
				result[key] = value;
			}
		}
	}

	return result;
}