function merge() {
  var res = {};

  for (var i = 0; i < arguments.length; i++) {
    var arg = arguments[i];
    var keys = Object.keys(arg);
    for (var j = 0; j < keys.length; j++) {
      var key = keys[j];
      res[key] = arg[key];
    }
  }

  return res;
}
- `utils.merge(x... : obj): obj`

    Merge two objects, a bit like `_.extend({}, x, y)`.