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= Object Oriented programming with R - S4 =

Object is a set of variables and functions  = slot [[BR]]

We need :  
 - to define the object --> setClass  and type the object
 - to define the function --> setMethod

Oriented object programmation:
 - prevent to add a character to a numeric
 - allows to check if the object follow some rules
 - enable to define one object like Inherit from the properties of another object, thus becoming its son   --> contains
 - allow to define all the tools concerning the object and to lock them up in blockss, without habing to look after anymore = encapsulation