3 ms·

Mutating maps during iteration is a big red flag.

• furyofantares 1y ago
  Yep. Which is part of why I'd much rather talk accurately about it being the iterator that may or may not encounter newly added values. That makes it a lot clearer where the problem is, which is also where the solution is: get the list of keys you want to work on ahead of time and iterate over those while modifying the map.