Processing is not really the "predecessor", it's still maintained and actively being developed. P5.js just exists in parallel and was a student-imagining of "wh

Processing is not really the "predecessor", it's still maintained and actively being developed. P5.js just exists in parallel and was a student-imagining of "what if Processing, but designed for the web from the get-go" that caught on and got folded into the official Processing offering =)