[WalterBright]

Designing for the future rarely works out very well. What does work, however, is encapsulation.

For example, in the 80's the linked list was my go-to data structure. It worked very well. But with the advent of cached memory, arrays were better. But my linked list abstractions were "leaky", meaning the fact that they were linked lists leaked into every use of them.

To upgrade to arrays meant changing a great deal of code. Now I encapsulate/abstract the interface to my data structures, so they can be redesigned without affecting the caller.