Value Objects are a great way to explicitly capture concepts within your domain. Value Objects are immutable, always in a valid state, provide behavior, and are defined by their value. This sounds a lot like Messages (Commands, Events) that are also immutable and should be in a valid state. However, exposing your Value Objects by using them within Commands or Events can have a negative impact on your ability to evolve your domain model.

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0:00 Intro
0:47 Value Objects
2:11 Examples
4:07 Leaking Value Objects in Messages

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