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proc_based_default_fallback

🔀 Proc-based Default Fallback​

Use a Proc as the :default option in I18n.t to lazily generate fallback values only when needed. This allows dynamic defaults based on runtime data, reducing unnecessary lookups and improving performance.

# config/locales/en.yml
en:
  greetings:
    hello: "Hello, %{name}"
# Usage in Ruby code
I18n.t("greetings.goodbye", default: -> { I18n.t("greetings.hello", name: user.name) })