Ruby

Ruby 3.x syntax

• Use pattern matching for structural dispatch on hashes, arrays, and domain data; avoid using it as a verbose if/elsif.
• Prefer endless methods only for tiny, obvious expressions. Multi-step behavior deserves a normal def.
• Hash shorthand ({name:, email:}) is clear when local names match keys; use explicit pairs when transformation happens.
• Use Ractor for isolated parallelism only when its object-sharing constraints fit better than threads or processes.

case payload
in {type: "user_created", id:, email:}
  create_user(id:, email:)
in {type: "user_deleted", id:}
  delete_user(id)
else
  raise ArgumentError, "unknown payload"
end