ZPE and ZPE/YASS are both very mature now. Both are incredibly fast and have a lot of functionality and features built in. BlackRabbit Script was first conceived in 2008 but didn't become a proper language until after a rebuild of it with version 1.x was started in January 2011. This marked the first time the language was actually usable. This was known as Operation Foghorn.
The initial release of BlackRabbit Script was in May of that year. It was baked into Painter Pro and Wonderword as a replacement for the Macro Scripting Interface Language they both featured (it was the basis of BlackRabbit Script anyway). The new BlackRabbit Editor Ultra Edition could interpret it separately from these programs.
Looking back at the whitepapers I produced and shared via my website in 2011 brings a bit of a chuckle: Operation Foghorn's syntax was considerably different from the language developed for ZPE/YASS. Foghorn laid out what BlackRabbit became, and ZPE is built entirely on how BlackRabbit Script works. The language itself was initially known as BlackRabbit Script (BRS) before getting the name Zenlang and finally settling on YASS; a lot of what made Operation Foghorn still stands today.
BRS was slow, though, and compared with ZPE, the interpreter was ten times slower! That's to say that the hard work involved in developing ZPE has paid off.
Speaking of which, the latest version of ZPE can compile 900 lines of code and interpret them in less than half a second. I mean, that's fast!
