Sublime

If OCP is applied well, further changes of that kind are achieved by adding new code, not by changing old code that already works.

The key to pursuing speed and adaptability at the same time is to view software technology as a continuously evolving asset, instead of something that is built once and then maintained.

Code tends to rot. As we add feature after feature and deal with bug after bug, the structure of the code degrades. Left unchecked, this degradation leads to a tangled, unmaintainable mess. XP teams reverse this degradation through frequent refactoring. Refactoring is the practice of making a series of tiny transformations that improve the

sub-OKR to turbocharge JavaScript.

Extending the behavior of a module does not result in changes to the source,

As John Gall wrote in [Gall03], “A complex system that works is invariably found to have evolved from a simple system that works.”