Problem with HashMaps and Resources

[IsaacGaches]

I'm working on a Minecraft-like chunk system where chunks load and unload around the player. I have a hash map resource that uses a position as a key and the chunk entity as the value. I'm not experienced with bevy or rust so I'm not sure why but, when I try to iterate over the dictionary and remove items, I get errors. Help please.
I've tried a few things but I don't know what I'm doing.

[james7132]

Hash requires Eq to be implemented on the type. Vec2 does not implement it since f32 does not implement it since NaN exists and breaks the contract of Eq. If you're doing a chunk map, you could use UVec2, which uses integers instead of f32, and it implements both Eq and Hash.

[IsaacGaches]

Thank you very much, that fixed one problem however I still have an insue...

or

[james7132]

You probably want HashMap::iter_mut instead. iter returns immutable references.

[IsaacGaches]

[james7132]

Ah you're trying to remove the ones that are away. You cannot mutate the HashMap structurally while iterating over it. Try HashMap::retain instead to keep only the chunks that match a given condition.