rc-js-util/docs/rc-js-util.equalityareconsistentlydefined.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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## equalityAreConsistentlyDefined() function

Returns true if both `A` and `B` are both null, undefined or 'defined'. Defined is not null and not undefined.

**Signature:**

```typescript
export declare function equalityAreConsistentlyDefined<T>(a: T | undefined | null, b: T | undefined | null): boolean;
```

## Parameters

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

Parameter


</th><th>

Type


</th><th>

Description


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

a


</td><td>

T \| undefined \| null


</td><td>


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

b


</td><td>

T \| undefined \| null


</td><td>


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

boolean

## Remarks

See [equalityAreConsistentlyDefined()](./rc-js-util.equalityareconsistentlydefined.md)<!-- -->.