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.

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

Regex (Regular Expression)

A sequence of characters that defines a search pattern, used for string matching, validation, and text manipulation.

A surface indication in code that usually corresponds to a deeper problem in the system, suggesting the need for refactoring.

Immutable Object

An object whose state cannot be modified after creation, providing thread safety and predictable behavior in concurrent systems.

The practice of designing application programming interfaces that are consistent, intuitive, and maintainable for developers to consume.

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