27 lines
915 B
Plaintext
27 lines
915 B
Plaintext
:title
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list_unique
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:sig
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StringList list_unique(StringList items)
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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 the first occurrence of each string, preserving input order.
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These helpers keep common data-shaping code close to render code, routers, and configuration trees. They are useful for route lists, navigation items, cards, and records that need simple transformations before rendering.
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```cpp
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auto tags = list_unique({"uce", "docs", "uce"});
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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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