Working with web applications in NodeJS is great. Using the same language and libraries on the client and server simplified the thinking. And NodeJS has fast tests and restart for a super quick edit-verify cycle when you’re coding. I like to write tests to verify the server-side and client-side logic, but do you know that the whole solution really is working? You can of course test your service manually after deploying, but that becomes tedious.

In his article Horizontal Reuse: An Alternative to Inheritance Toby Inkster compares how to implement multiple inheritance or mixins in Java, Perl, PHP and Ruby. It’s a very interesting comparison of programming languages features and well worth the read. Toby writes: In class-based object-oriented programming, when there are classes that appear to share some functionality, this is often a time when people will refactor them into two subclasses of a common base class, avoiding repetition.