Reference documentation and lots of examples are available directly on the [website](http://p5js.org/).
Ranked in these QuestionsQuestion Ranking
Pro Accessible documentation
Reference documentation and lots of examples are available directly on the website.
Pro Great community
p5 users benefit from the Processing community's 15+ years of growth and discovery. Processing code can easily be converted to p5.
Pro Easiest to learn to obtain high grade results
In a few days any body can understand extremely complex figures in a few minutes.
Pro A lot of YouTube tutorials
Pro General Programming Concepts
As a continuation of the Processing project, this frameworks helps in understanding the general programming concepts that goes beyond drawing (connecting electronics, using sounds or the webcam etc),
Pro Supports WebGL w/ canvas fallback
Pixi is a WebGL renderer, but can fall back to canvas if WebGL is not supported or turned off.
Pro Will be familiar to ActionScript developers
Pixi.js uses a code structure that's very similar to ActionScript.
Con No built-in rendering
If looking for something to build UIs with or similar, one might be disappointed by the lack of any pre-defined UI element objects and such in p5.js. One has to write all the rendering code for any objects one includes, integrating it appropriately with the loop.
Con Not a complete solution
Pixi only provides the renderer.