27 lines
966 B
Plaintext
27 lines
966 B
Plaintext
:title
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dv_keys
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:sig
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StringList dv_keys(DValue tree)
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:see
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StringList
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0_DValue
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filter
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:content
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Returns map keys from a DValue. Scalar values produce an empty list.
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These helpers are intentionally small data-shaping conveniences for render code, routers, and configuration trees. They are useful when porting habits from React/Next/Remix code where lists of routes, navigation items, cards, or records are transformed close to the rendering boundary.
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```cpp
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StringList keys = dv_keys(context.cfg["menu"]);
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```
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Prefer these helpers over open-coded loops when the transformation itself is the important part of the code. Use an explicit loop when mutation, error handling, or side effects are the main concern.
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## Related Concepts
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- JavaScript / React: `Array.map`, `Array.filter`, `Array.find`, object `pick`/`omit`, and grouping route or navigation records before rendering.
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- PHP: `array_map`, `array_filter`, `array_unique`, and associative array projection.
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