Ruby, Rubocop, Software Metrics, Ruby on Rails, Software Development.
-- variable name `$foo` # (sym :foo)) -- assigned value `:foo` @foo = :foo # assignments = 1 # (ivasgn -- instance variable assignment # :@foo -- variable name `@foo` # (sym :foo)) -- assigned value `:foo` @@foo = :foo # assignments = 1 # (cvasgn -- class variable assignment # :@@foo -- variable