Example: parametric sketches

[ajspadial]

Show how to use Javascript ability to create new functions (closures) so that we can obtain a parametrized sketch in different contexts.

This wouldn't be a port from Processing, because it's a typical Javascript feature.

I think this example should be in the instatiation chapter

[ajspadial]

Could anyone assign this issue to me? It seems I'm not allowed to do so.