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

An efficient search algorithm that finds a target value in a sorted array by repeatedly dividing the search interval in half.

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

Observer Pattern

A design pattern where an object (subject) maintains a list of dependents (observers) that are notified automatically of state changes.

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

Testing individual components or functions of a program in isolation to verify they work correctly.

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

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