Sometimes, we need to build NumPy arrays of unknown size to work with them in the future. Problem statement Suppose we want to build a NumPy array on the fly, and we do not know the size of this array in advance, the array would result in a new array containing all the elements that...
# The :test delivery method accumulates sent emails in the # ActionMailer::Base.deliveries array. config.action_mailer.delivery_method = :test # Unlike controllers, the mailer instance doesn't have any context about the # incoming request so you'll need to provide the :host parameter yourself...