Sometimes, your objects are only data and no behaviour. These are value objects, and they are defined by their _contents_. These objects are immutable, so it is safe to let them propagate throughout the system. Being immutable, value objects cannot be modified; their contents are set once on initialisation. Also, being identified by their contents, two entities with the same contents are considered equal.
Required Ruby Version
>= 0
Authors
Arjan van der Gaag