8 ms·

Case in point: the left-pad package has quadratic complexity.

• mcguire 10y ago
  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 10y ago
    Yeah, as far as I know in modern JS engines += is actually faster than using an array.
  • x1024 10y ago
    [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?