[zazaulola]

There is a website that contains thousands of such examples.

https://www.dwitter.net/

Dwitter is like Twitter, but for one-line javascript examples using canvas. Users are limited to 140 bytes in their creations.

[rsiqueira]

Here is a sample of an animated XOR texture in just 122 characters of JS code: https://www.dwitter.net/d/255

And here are several variations using other binary operators to create the Sierpinski triangle: https://www.dwitter.net/h/sierpinski