rc-js-util/docs/rc-js-util.fpmaybenewvalue.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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## fpMaybeNewValue() function

Returns the newValue if defined, else the old value.

**Signature:**

```typescript
export declare function fpMaybeNewValue<TValue>(newValue: TValue | null | undefined, oldValue: TValue): TValue;
```

## Parameters

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

Parameter


</th><th>

Type


</th><th>

Description


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

newValue


</td><td>

TValue \| null \| undefined


</td><td>


</td></tr>
<tr><td>

oldValue


</td><td>

TValue


</td><td>


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

TValue

## Remarks

See [fpMaybeNewValue()](./rc-js-util.fpmaybenewvalue.md)<!-- -->.