[mcguire]

Depends on the JS implementation in question. And I think node uses one that optimizes string concatenation, possibly making that the fastest way to do it.

[emodendroket]

Yeah, as far as I know in modern JS engines += is actually faster than using an array.

[x1024]

[citation needed]

It's really nice how we once again depend on "I think some guys do it like this" for performance. What happened to standards?

What's next? SEO for code?