Set object by path value

gistfile1.js

/**
* @author devman
*/
function setObjectPathValue(source, path, value) {
    var parts = path.split('.'), len = parts.length, target = source;

    for (var i = 0, part; i < len - 1; i++) {
        part = parts[i];
        target = target[part] == undefined ? (target[part] = {}) : target[part];
    }
    target[parts[len - 1]] = value;
    return target;
}