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

## \_Map.concat property

Used with maps that store arrays. Where an array exists for a given key the values will be appended to that array, otherwise a copy of values array will be inserted.

**Signature:**

```typescript
static readonly concat: typeof mapConcat;
```

## Remarks

See [mapConcat()](./rc-js-util.mapconcat.md)<!-- -->.