27 lines
1.1 KiB
Plaintext
27 lines
1.1 KiB
Plaintext
:title
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dtree_map
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:sig
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DTree dtree_map(DTree tree, function<DTree (DTree, String)> f)
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:see
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StringList
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0_DTree
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filter
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:content
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Transforms each child. List-like input stays list-like; map input keeps keys.
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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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DTree titles = dtree_map(items, [](DTree item, String key) { DTree out; out = item["title"].to_string(); return(out); });
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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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