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 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 Great community
p5 users benefit from the Processing community's 15+ years of growth and discovery. Processing code can easily be converted to p5.
Pergola runs seamlessly in an HTML environment (option in configuration file). All the examples are provided both as SVG standalone and embedded in HTML, and are strictly equal.
Besides its universal Node Helper (http://www.svgmagazine.com/jul2011/dom-helper.html) Pergola also provides the equivalent for building HTML nodes and <foreignObject> HTML nodes.
Pro SVG native
The first and most accomplished SVG native library, 100% cross-platform compatible.
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.