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Design Patterns

Design patterns are reusable ways to solve common software design problems.

What Are Design Patterns​

Patterns give names to recurring structures and tradeoffs in code.

They are useful when they simplify communication and reduce repeated design work.

How To Use Design Patterns​

Use patterns when they fit a real problem. Avoid adding a pattern only because it sounds formal.

Basic Example​

class Logger {
  log(message: string) {
    console.log(`[app] ${message}`);
  }
}

const logger = new Logger();
logger.log("Started");

Common Concepts​

  • Creational patterns handle object creation.
  • Structural patterns organize relationships.
  • Behavioral patterns coordinate actions.
  • Patterns should reduce complexity, not add ceremony.

What To Learn Next​

Learn factory, adapter, strategy, observer, dependency injection, repository, and when simple functions are enough.