:sig
DTree DTree::get_by_path(String path, String delim = "/")

:params
path : slash-delimited path to traverse
delim : optional path separator
return value : the resolved child node, or an empty `DTree` when the path cannot be followed

:see
0_DTree
0_Request
>types
json_decode

:content
Traverses a nested `DTree` without creating missing keys.

Empty path segments are ignored, so leading and trailing `/` characters are harmless. If any intermediate node is not a map or a segment is missing, `get_by_path()` returns an empty `DTree`.

## Example

```cpp
context.cfg.get_by_path("theme/options/portal-dark/label").to_string()
```

## Related Concepts

- PHP: deep array access helpers for associative arrays, decoded JSON, or configuration trees
- JavaScript / Node.js: optional chaining like `obj?.a?.b`, lodash `get`, or small path-walking helpers