rc-js-util/docs/rc-js-util._map.firstkey.md

A collection of TS and C++ utilities to help writing performant and correct applications, achieved through strict typing and (removable) invariant checking.

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[Home](./index.md) &gt; [rc-js-util](./rc-js-util.md) &gt; [\_Map](./rc-js-util._map.md) &gt; [firstKey](./rc-js-util._map.firstkey.md)

## \_Map.firstKey property

Gets the first inserted key in a `Map`<!-- -->.

**Signature:**

```typescript
static readonly firstKey: typeof mapFirstKey;
```

## Remarks

See [mapFirstKey()](./rc-js-util.mapfirstkey.md)<!-- -->.