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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.

Related Terms

Stack vs Heap
Two memory regions: the stack stores function call data with automatic cleanup, while the heap stores dynamically allocated objects.
Closure
A function that captures and retains access to variables from its enclosing scope, even after that scope has finished executing.
Twelve-Factor App
A methodology of twelve best practices for building modern, scalable, maintainable software-as-a-service applications.
API Design
The practice of designing application programming interfaces that are consistent, intuitive, and maintainable for developers to consume.
Concurrency
The ability of a program to manage multiple tasks that can make progress during overlapping time periods.
Singleton Pattern
A design pattern that restricts a class to a single instance and provides a global point of access to that instance.
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