What is not in this catalog ?

It is not yet another catalogue of Design Patterns. It does not answer to questions like what is a given Design Pattern useful for, how it works or in which context it applies. 

Patterns themselves are generally not described in this course. Patterns and usage samples are widely documented on the internet. 

We will soon propose a merge with the site of Cédric Bouhours. It is the right place to discover Design Patterns!

Before starting an exercise, be sure you have understood the underlying pattern.