27 lines
805 B
Markdown
27 lines
805 B
Markdown
<!-- Do not edit this file. It is automatically generated by API Documenter. -->
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[Home](./index.md) > [@apextoaster/js-utils](./js-utils.md) > [getHeadOrDefault](./js-utils.getheadordefault.md)
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## getHeadOrDefault() function
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Get the first element from the specified key, within a map of lists, or a default value when the key does not exist or is nil.
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<b>Signature:</b>
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```typescript
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export declare function getHeadOrDefault<TKey, TVal>(map: Map<TKey, ReadonlyArray<Maybe<TVal>>>, key: TKey, defaultValue: TVal): TVal;
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```
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## Parameters
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| Parameter | Type | Description |
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| --- | --- | --- |
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| map | Map<TKey, ReadonlyArray<[Maybe](./js-utils.maybe.md)<!-- --><TVal>>> | |
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| key | TKey | |
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| defaultValue | TVal | |
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<b>Returns:</b>
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TVal
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