:sig
StringList DValue::keys() const

:params
return value : child keys for map/list values; empty for scalars

:see
0_DValue
2_DValue_each
0_StringList

:content
Returns the keys produced by `each()`. Scalar values have no child key, so the result is empty. List-shaped values return their numeric keys as strings.

```cpp
StringList names = context.props["user"].keys();
```