Question

I am trying to write a routing framework of nodejs, I need to add some helper methods for ServerRequest and ServerResponse. I notice express has change it way from modify prototype to

express/response.js

var res = module.exports = {
  __proto__: http.ServerResponse.prototype
};

res.redirect = function (url) {
  ...
}

And express/middlewares.js

expressInit = function(req, res, next) {
  // ...
  res.__proto__ = app.response;
  next()
}

But in my framework, I just like to do it simple:

http.ServerResponse.prototype.redirect = function(url) {
  ...
}

I don’t know if there is something I don’t know of why express change the style of override.

Answer 1

Note that the __proto__ pseudo-attribute is non-standard so it’s use was never really appropriate; moreover, it is now considered “deprecated” according to the Mozilla Developer Network (MDN).

However, the prototype property of Functions is a standard part of the language and its use is always safe.

Always use MyFunction.prototype, never use myObject.__proto__.