A (mostly) referentially-transparent retry method in Ruby that doesn't mutate local state.

with_retry.rb

def with_retry(timeout=0.25, tries=3)
  exception = \
    tries.times.reduce(nil) do
      begin
        result = yield
      rescue StandardError => ex
        sleep timeout
        ex
      else
        return result
      end
    end
  raise exception
end