:metro:

Description

• https://en.wikipedia.org/wiki/Open%E2%80%93closed_principle

• "software entities (classes, modules, functions, etc.) should be open for extension, but closed for modification"; that is, such an entity can allow its behavior to be extended without modifying its source code.
• Bertrand Meyer is generally credited for having originated the term open–closed principle, which appeared in his 1988 book Object Oriented Software Construction.

• http://principles-wiki.net/principles:encapsulate_the_concept_that_varies?redirect=1

• 
• (OCP == ECV)

• http://blog.cleancoder.com/uncle-bob/2014/05/12/TheOpenClosedPrinciple.html
• https://drive.google.com/file/d/0BwhCYaYDn8EgN2M5MTkwM2EtNWFkZC00ZTI3LWFjZTUtNTFhZGZiYmUzODc1/view?resourcekey=0-FsS837CGML599A_o5D-nAw
• https://cleancoders.com/episode/clean-code-episode-10

Related knowledge

• SOLID Principles