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

## \_Map.union property

Returns a map with keys from both A and B. If both A and B have the same key the value from B will be used.

**Signature:**

```typescript
static readonly union: typeof mapUnion;
```

## Remarks

See [mapUnion()](./rc-js-util.mapunion.md)<!-- -->.