A handy guide to the basic principles of Object Oriented Programming and Design. Covers standard and accepted principles, design patterns, and more! This is not intended to teach OOP, but as a reminder for those who already learned.
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Single Responsibility Principle
A class changes for only one reason
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Open/Closed Principle
A class should be open for extension, closed for editing
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Liskov's Substitution Principle
Derived types should cleanly and easily replace base types
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Interface Segregation Principle
Favor multiple single-purpose interfaces over composite
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Dependency Inversion Principle
Concrete classes depend on abstractions, not vice-versa
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Don't Repeat Yourself (DRY)
Duplication should be abstracted
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Law of Demeter
Only talk to related classes
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Hollywood Principle
"Don't call us, we'll call you"
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You Ain't Gonna Need It
Only code what you need now
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Keep It Simple, Stupid
Favor clarity over cleverness
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Convention Over Configuration
Defaults cover 90% of uses
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Encapsulation
What happens in Vegas...
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Design By Contract
And then write tests
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Avoid Fragile Base Class
Treat Base like a public API
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Common Closure Principle
Classes that change together, stay together
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Encapsulate Field
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Generalize Type
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Type-Checking ⇒ State/Strategy
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Conditional ⇒ Polymorphism
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Extract Method
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Extract Class
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Move/Rename Method or Field
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Move to Superclass/Subclass
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Private
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Only inside the same class instance
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Protected
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Inside same or derived class instances
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Public
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All other classes linking/referencing the class
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Internal
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Only other classes in the same assembly
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Protected Internal
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All classes in same assembly, or derived classes in other assembly
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Static
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Accessible on the class itself (can combine with other accessors)
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Abstract Factory
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Creational
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Builder
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Creational
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Factory Method
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Creational
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Prototype
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Creational
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Singleton
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Creational
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Adapter
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Structural
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Bridge
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Structural
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Composite
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Structural
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Decorator
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Structural
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Facade
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Structural
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Flyweight
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Structural
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Proxy
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Structural
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Chain of Responsibility
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Behavioral
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Command
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Behavioral
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Interpreter
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Behavioral
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Iterator
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Behavioral
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Mediator
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Behavioral
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Memento
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Behavioral
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Observer
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Behavioral
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State
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Behavioral
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Strategy
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Behavioral
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Template Method
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Behavioral
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Visitor
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Behavioral
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thank you so much - this is perfect!
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