Hacker News Reader

"objects-linked-to-other-objects" - why not use the established "composition over inheritance": http://en.wikipedia.org/wiki/Composition_over_inheritance

Or does it mean something else?

View on HN

OLOO is quite different from both inheritance and composition. It embraces delegation rather than covering it up or running away from it. :)

Can you give an actual example of the difference between composition and delegation? In my definition those two are just two different perspectives on the same thing.

A super quick, simple illustration of the difference, which comes down to the fact that delegation is differential, whereas composition is complete:

https://gist.github.com/getify/9895188

For a bit more "real world" of a scenario, you can also compare the `LoginController` / `AuthController` mechanism here, first shown with inheritance+composition, and then shown with simpler OLOO-style delegation:

https://github.com/getify/You-Dont-Know-JS/blob/master/this%...

Ah, thanks. That clarifies things. Neat!

Reply on news.ycombinator.com