1. we're about Javascript AKA ECMA script not a specific implementation. So we don't cover issues specific to one environment or interpreter, like browsers or V8 for node.
2. micro-performance is out of scope: anything that's not a result of essential algorithmic complexity (e.g O(log n) vs O(n^2)) is down to a specific version of a specific interpreter (see 1).
3. please test code examples to ensure they work, there's nothing more confusing than incorrect examples!
4. contributing to JS garden makes you a fantastic person, and Brendan Eich will find you immensely attrative.

Thank you for being kind enough to help out!