func.rb

# Little functional quirk to replace a CASE statement, when you first query an object
# and call a method to command an action. You can pass a block at the end for an ELSE
# statement.
#
# Usage:
#
# Func.switch order,
#   available?: -> { order.submit },
#   returned?: -> { order.cancel }
#
# Func.switch order,
#   available?: :submit,
#   returned?: :cancel
#
# if object.available?
#   object.submit
# elsif object.returned?
#   object.cancel
# end

class Func
  def self.switch(object, hash)
    hash.each do |method, func|
      next unless object.public_send(method)
      return case func
        when Symbol
          object.public_send(func)
        when Proc
          func.()
        else
          raise ArgumentError
        end
    end
    yield if block_given?
  end
end