Elixir Thinking

Resumo (pt-BR): Guia mental para escrever Elixir evitando padrões OOP. Regra de ouro: nenhum processo sem necessidade de runtime (estado mutável, concorrência ou isolamento de falha).

Mental shifts required before writing Elixir. These contradict conventional OOP patterns.

The Iron Law

NO PROCESS WITHOUT A RUNTIME REASON

Before creating a GenServer, Agent, or any process, answer YES to at least one:

1. Do I need mutable state persisting across calls?
2. Do I need concurrent execution?
3. Do I need fault isolation?

All three are NO? Use plain functions. Modules organize code; processes manage runtime.