# virtual_map.keys · Rell standard library · Chromia Docs (concept)

> pure function keys(): set <K> Since 0.9.0

Source: https://docs.chromia.com/pages/rell-stdlib/-rell-system-library/root/virtual_map/keys/

FUNCTION

# virtual\_map.keys

```signature
pure function keys(): set<K>
```

Since 0.9.0

[View this page on docs.chromia.com](https://docs.chromia.com/pages/rell-stdlib/-rell%20-system%20-library/%5Broot%5D/virtual_map/keys.html)Generated API reference, mirrored from the live docs