wrapper_engine

Wrappers and Engines

As the programming tasks we face become more complicated, leveraging the value of storing repeated code in subroutines becomes more challenging.
We've already seen one useful technique: Write simple 'wrapper' functions around 'engine' functions which contain the repeated code and which do the heavy lifting.
A wrapper's interface should be designed for user-friendliness. The test of user-friendliness:
Does the interface prompt the user to pass the correct number and type of arguments to the engine?