Programming Concepts Intermediate

What is Design Pattern?

A reusable solution template for commonly occurring problems in software design.

Design patterns are proven solutions to recurring design problems. The Gang of Four book categorizes them into creational (Singleton, Factory, Builder), structural (Adapter, Decorator, Proxy), and behavioral (Observer, Strategy, Command) patterns.

Patterns provide a common vocabulary for developers and help create flexible, maintainable code. However, overusing patterns adds unnecessary complexity. Apply patterns when they solve a clear problem, not preventively.

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Restructuring existing code without changing its external behavior to improve readability, maintainability, and performance.

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A system that records changes to files over time, allowing you to recall specific versions, collaborate, and track history.

A software development methodology that emphasizes iterative development, collaboration, and rapid response to change.

A step-by-step procedure for solving a problem or performing a computation, defined as a finite sequence of instructions.

The implied cost of additional rework caused by choosing a quick solution now instead of a better approach that would take longer.

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