Real Impact of the Singleton Design Pattern

This post has been about a month in the offing. Back in August, I wrote about what the singleton pattern costs you. This prompted a good bit of discussion, most of which was (as it always is) anecdotal. So, I conceived of an experiment that I called the singleton challenge. Well, the results are in. I’m going to quantify the impact of the singleton design pattern on codebases.
I would like to offer an up-front caveat. I’ve been listening lately to a fascinating audiobook called “How to Measure Anything," and it has some wisdom for this situation. Measurement is primarily about reducing uncertainty. And one of the driving lessons of the book is that you can measure things – reduce uncertainty – without getting published in a scientific journal.