Free  Understanding Design Patterns - Observer

Defines a one-to-many dependency between objects so that when on object changes state, all of its dependents are notified and updated automatically. Mary just became a new Mom! Like all new mothers, she is very excit...

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Free  Understanding Design Patterns - Singleton

Ensures a class has only one instance, and provides a global point of access of it. The health clinic has recently offered free medicines if you come in for a checkup. The promotional stint is wo...

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Free  Understanding Design Patterns - Abstract Factory

Provide an interface for creating families of related or dependent objects without specifying their concrete classes. Business is bombing at Dragon Inc. and the CEO wants to franchise all overseas branches. ...

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Free  Understanding Design Patterns - Factory Method

Define an interface for creating an object, but let the classes that implement the interface decide which class to instantiate. The Factory method lets a class defer instantiation to subclasses. ...

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Free  Understanding Design Patterns - Simple Factory

This series has been written for developers new to software design patterns and those who find software design patterns difficult to understand. Dragon Inc. is one of the top toy manufacturers in China. ...

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