rc-js-util/docs/rc-js-util.referencecounter.add.md

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

<!-- Do not edit this file. It is automatically generated by API Documenter. -->

[Home](./index.md) &gt; [rc-js-util](./rc-js-util.md) &gt; [ReferenceCounter](./rc-js-util.referencecounter.md) &gt; [add](./rc-js-util.referencecounter.add.md)

## ReferenceCounter.add() method

**Signature:**

```typescript
add(key: TKey): number;
```

## Parameters

<table><thead><tr><th>

Parameter


</th><th>

Type


</th><th>

Description


</th></tr></thead>
<tbody><tr><td>

key


</td><td>

TKey


</td><td>


</td></tr>
</tbody></table>
**Returns:**

number