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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Related Terms

Functional Programming

A programming paradigm that treats computation as the evaluation of mathematical functions, avoiding state changes and mutable data.

The process of finding and fixing errors (bugs) in software code to ensure correct program behavior.

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

DRY (Don't Repeat Yourself)

A software development principle that aims to reduce code duplication by abstracting common patterns into reusable components.

A linear data structure where elements are stored in nodes, each containing data and a pointer to the next node in the sequence.

SOLID Principles

Five design principles for writing maintainable, flexible object-oriented code: Single Responsibility, Open-Closed, Liskov Substitution, Interface Segregation, and Dependency Inversion.

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