rc-js-util/docs/rc-js-util._map.addtoset.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; [addToSet](./rc-js-util._map.addtoset.md)

## \_Map.addToSet property

Used with maps that store sets. Where a set exists for a given key the value will be added to that set, otherwise a new set will be created containing the value.

**Signature:**

```typescript
static readonly addToSet: typeof mapAddToSet;
```

## Remarks

See [mapAddToSet()](./rc-js-util.mapaddtoset.md)<!-- -->.