The block "js function(){}"is very usful for implement advanced things.I'f done some color algebra 
using js.Like: 
+ 
= (Sorry,I cant type colors,so I use emoji.)
+ 
= 
+ =
You use pictures.
The block "js function(){}"is very usful for implement advanced things.I'f done some color algebra using js.Like: + = (Sorry,I cant type colors,so I use emoji.)
+ =
+ =
You use pictures.