> ## Documentation Index
> Fetch the complete documentation index at: https://docs.qu.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# mask

```ts theme={null}
function mask(_value, _bits): bigint
```

Mask `value` with a bitmask of `bits` ones.

## Parameters

| Parameter | Type                                                     | Description                 |
| :-------- | :------------------------------------------------------- | :-------------------------- |
| `_value`  | [`BigNumberish`](/sdk/content/type-aliases/BigNumberish) | The value to mask.          |
| `_bits`   | [`Numeric`](/sdk/content/type-aliases/Numeric)           | The number of bits to mask. |

## Returns

`bigint`

The masked value.

## Source

[utils/maths.ts:106](https://github.com/dominant-strategies/quais.js/blob/c1c12d43f9d34c6baad2b0542bd6d0acd6fefcbf/src/utils/maths.ts#L106)