code: function retrieve(obj, path) {
    if (!path) {
      return obj;
    }
  
    var arr = path.split(DELIMITER);
    var result = obj;
    for (var i = 0, l = arr.length; i < l; i++) {
      result = result[arr[i]];
    }
    return result;
  }
docs: obj = { a: { b: 1 } } retrieve(obj, 'a_$$$_b') => 1