@schsam woah, that's pretty cool! I guess I should I learn it.

I can speak for myself, tet5uo, but solving problems and reading other coders smart solutions surely helped me in creating smarter and more "compressed" code.

A LOT.

Not that it is always best practice (on the contrary, often...), but it is an excellent training ground for abstraction skills and syntax proficiency.

I am confused: according to wiki it does not seem that faster (while it is certainly more complex to implement) than the old SoE, then I wonder how it would perform against a SoE testing just odd numbers in the form 6k+/-1.

Spaghetti.... jummy :D

The Sieve of Atkin is faster: https://en.wikipedia.org/wiki/Sieve_of_Atkin

You have Array.prototype.range

You don't want range in the template. The template had:

Array.range = function(start, count) {
return [];
}