学ぶ Pattern Categories Overview | Introduction to Design Patterns

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Understanding design patterns begins with recognizing their three primary categories: creational, structural, and behavioral. Each category addresses a distinct aspect of software design and offers solutions to common challenges in JavaScript development.

Creational patterns focus on how you create objects. In JavaScript, this often means deciding whether to use constructors, factory functions, or other mechanisms to control the instantiation process. These patterns help you manage object creation to ensure flexibility and reuse.

Structural patterns are about how objects and classes are composed to form larger structures. In JavaScript, this may involve combining objects, wrapping them, or defining relationships that make your code more modular and maintainable.

Behavioral patterns are concerned with how objects interact and communicate. These patterns help manage responsibilities, control the flow of information, and define how objects cooperate to perform tasks.


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// Creational: Factory function for creating objects
function createUser(name) {
  return { name };
}

// Structural: Wrapping an object to add new behavior
function withLogger(obj) {
  return {
    ...obj,
    log() {
      console.log("Logging:", obj);
    }
  };
}

// Behavioral: Notifying observers of an event
function notifyAll(observers, message) {
  observers.forEach(observer => observer.update(message));
}

1. Which category of design patterns focuses on object creation?

2. Structural patterns are primarily concerned with:

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