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

The ability of a program to manage multiple tasks that can make progress during overlapping time periods.

A way of organizing and storing data in a computer so it can be accessed and modified efficiently.

Dependency Injection

A design pattern where objects receive their dependencies from external sources rather than creating them internally.

DRY (Don't Repeat Yourself)

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

A data structure that maps keys to values using a hash function, providing average O(1) time complexity for lookups, insertions, and deletions.

The smallest unit of execution within a process, allowing concurrent operations to run within a single program.

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