Definition :
The Law of Demeter or principle of least knowledge is a design guideline for developing software, particularly object-oriented programs. In its general form, the LoD is a specific case of loose coupling.
Further Reading :
Book : Applying UML and Patterns by Craig Larman.
Definition :
In object-oriented programming, the open/closed principle states “software entities should be open for extension, but closed for modification”; that is, such an entity can allow its behaviour to be extended without modifying its source code.
Further Reading :
Book : Applying UML and Patterns by Craig Larman.
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