nushell/docs/commands/dfr_is-null.md

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---
title: dfr is-null
layout: command
version: 0.59.0
---
Creates mask where value is null
## Signature
```> dfr is-null ```
## Examples
Create mask where values are null
```shell
> let s = ([5 6 0 8] | dfr to-df);
let res = ($s / $s);
$res | dfr is-null
```