1. A method, comprising: allowing, within a code reuse user interface executed by a processor, a code developer to specify unused data variables of a coded object definition to be reused, from pre-existing code within a new application, as a partial object without instantiation of the unused data variables; detecting within the code reuse user interface an indication from the code developer that at least one data variable of the reused coded object definition is specified as unused in the new application; and externalizing, from the code reuse user interface to a runtime environment, the specified at least one unused data variable of the reused coded object definition, where as part of execution of the new application in the runtime environment, the runtime environment instantiates the reused coded object definition as the partial object without instantiation of the specified at least one unused data variable.