value-object-patterns

What problem does it solve?

This Skill provides expert guidance on designing and implementing Value Objects in Domain-Driven Design (DDD), solving common issues like primitive obsession, inconsistent validation, and unclear domain logic. It helps you build more type-safe, immutable, and expressive domain models.

Core Features & Use Cases

• Core Concepts: Explains the fundamentals of Value Objects, their immutability, equality, and self-validation, distinguishing them from Entities.
• Design & Implementation Patterns: Offers common patterns for various Value Objects (e.g., Money, EmailAddress, DateRange) and strategies for validation.
• Primitive Obsession Detection: Includes a script to identify areas in your codebase where primitive types could be replaced by Value Objects.
• Use Case: When refactoring a legacy codebase, use this skill to identify string or number parameters that represent domain concepts (like email, amount, userId). Then, apply the provided templates and patterns to create dedicated Value Objects, improving type safety and encapsulating domain logic.

Quick Start

Use the value-object-patterns skill to detect primitive obsession in the 'src/domain/' directory. Suggest suitable Value Object patterns for the identified issues. Provide a template for a simple Value Object for an 'EmailAddress'.