This is example of visual programing editor by MameBlock.js.
"p5.js is a JavaScript library that starts with the original goal of Processing, to make coding accessible for artists, designers, educators, and beginners, and reinterprets this for today's web." - p5.js
Notice: all commands and constants need "p."
You can use [Stop] and [Run] button.
Drag & drop block, Click expression for edit code.
Edit blocks and click [Run] for exce demo