Domain

What is the "domain"? What is a "model"?

• why have a model?
• why prefer Value Objects?
• how does good OOP mirror FP (or vice-versa)?
• immutability
• sensible data structures underpinning immutable objects
• sacrifice performance by default
• how is good OOP different from FP?
• prefer fine-grained abstraction pushed to "leaf nodes" of the object hierarchy
• avoid highly generic constructs
• [tbd - domain-v-model.jpg]

Objects capture lifetimes

• nouns to capture ephemeral/lifetime ideas: session (other examples?)
• the lifecycle of an object is more important than mirroring the real world

Non-standard domains

• the web server itself can be a domain
• a scheduler object(s)
• Try: push as much of your code into the "domain" as possible
• pure
• immutable
• small & value-based
• in clojure, this is capturing more data and less behaviour

Domain through API

• REST v CRUD
• Representational State Transfer - why?
• HTTP verb hacks
• immutability behind the scenes w mutable APIs
• DTOs