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Categories, also known as class extensions, are a unique feature of Objective-C. They allow developers to add new methods to an existing class without modifying its original source code, similar to extension methods in C# or partial classes in other languages. Key Purposes of Categories Adding functionality to framework or third-party classes ...

Data Flow Diagrams and Structured Analysis When constructing data flow diagrams (DFDs), several key principles must be followed: Each process requires both input and output data flows. Data flows can only connect to processes—either from a source to a process, or from a process to a sink. All data flows and data stores must have definitions in ...

Overview The Observer Pattern, also known as the Publish-Subscribe Pattern, defines a one-to-many dependency between objects. When the state of a subject object changes, all dependent observers are automatically notified and updated. This behavioral pattern decouples the subject from its observers, enabling loose coupling through a message-broa ...

Architecting the System To build a functional library management system in Java, we need to organize our code in to distinct modules: data models for books, user hierarchies for different access levels, and a decoupled set of operations. This approach leverages Object-Oriented Programming (OOP) concepts like inheritance, polymorphism, and encap ...