Design: Principle of Least Knowledge “Talk only to your immediate friends”

This principle prevent us from creating designs that have a large number of classes coupled together. When you build a lot of dependencies between many classes, you are buliding a system that will be costly to mantain and complex for others to understand.

The principle provide some guidelines: take an object and for any method in that object the principle tell us that we should only invoke methods that belong to:

• the object itself
• object passed in as a parameter to the method
• any object the method creates or instantiates
• any component of the object

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