implement-value-objects

What problem does it solve?

This Skill guides developers to implement immutable, self-validating value objects in a Domain-Driven Design context, ensuring invariants are preserved and domain concepts are expressed clearly.

Core Features & Use Cases

• Immutable by design: value objects have no identity and are defined by their attributes.
• Self-validation: constructors enforce valid states, preventing invalid data from entering the domain.
• Equality by value: equality checks are based on all relevant attributes, not identity.
• Composition & behavior: value objects can be composed into more complex types with domain behavior.
• Testing guidance: provides table-driven tests and boundary-case coverage to validate behavior.

Quick Start

Create a new value object in your domain, implement a constructor with validation, add equality checks and small domain methods, then write unit tests and run them.