[r-spaghetti]

Or delete them or set to null inside the loop?

[pkolaczk]

Setting to null doesn't release the memory. It only erases the reference. You still need to wait for the GC to complete.

[baq]

Side note: it might work in a refcount GC like CPython. That isn’t node though. (It only might because it doesn’t guarantee that memory is actually reused.)