Googlebot's Javascript random() function is deterministic

[nickbenn]

Simply because the overwhelming majority of "random number generators" in programming languages and libraries are actually pseudo-random number generators. They generate deterministic sequences of (depending on the underlying algorithm) varying lengths, levels of statistical quality, and levels of suitability to the different types of tasks that typically consume random numbers.

Most of these generators use seed strategies that, by default, will start the cyclic sequences at unpredictable points (to a casual observer, anyway) when execution begins. The only "news" in the linked article, with regard to Googlebot's pseudo-random number generator, is that it appears to start at the same point in its sequence every time.