The Forwardable module in Ruby provides delegation of specified methods to a designated object, using the methods def_delegator and def_delegators.

Ram talks with the computer with the help of a memory controller on the CPU. So the reason why its often suggested to prefer to have multiple RAM modules rather than a single one is due to memory channels. If the memory controller within the CPU supports multi-channel architecture then it can leverage it having multiple RAMs than having a single one as it helps in faster data exchange. Like if it’s dual channel then a pair, quad channel then four modules, etc.

Rspec has argument matchers any_args for matching any number of args at any point in an arg list and anything for matching anything and everything.

Capybara defaults to requiring an href attribute exist when finding links. To handle such cases we can pass href: nil as an option thus enabling to find it.

Rails has an ActiveSupport::Notifications module which is a part of its core instrumentation API. This API allows users to define hooks on events. With the ActiveSupport::Notifications you can instrument an event by simply calling instrument with a name, payload and a block. The notification will be sent after the block returns. Now all you need is to define subscribe method which consumes the event based on event name and you can define your on callback code here, sort of like a Pub/sub pattern.