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

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

:see
0_DValue
0_Request
>types
json_decode
has
to_string

:content
Traverses a nested `DValue` without creating missing keys. This is a read accessor: it is `const` and never modifies the tree, unlike `operator[]`, which creates missing entries.

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 `DValue`.

A missing path therefore reads like an empty value — combine it with the `to_*` default arguments to express a fallback in one call:

## Example

```cpp
String label = context.cfg.get_by_path("theme/options/portal-dark/label").to_string("Portal Dark");
s64 page_size = context.cfg.get_by_path("app/page_size").to_s64(25);
```

## 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