---
title: sampledata.bool() function
description: >
  `sampledata.bool()` returns a sample data set with boolean values.
menu:
  flux_v0_ref:
    name: sampledata.bool
    parent: sampledata
    identifier: sampledata/bool
weight: 101
---

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`sampledata.bool()` returns a sample data set with boolean values.



##### Function type signature

```js
(?includeNull: bool) => stream[A] where A: Record
```

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For more information, see [Function type signatures](/flux/v0/function-type-signatures/).
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## Parameters

### includeNull

Include null values in the returned dataset.
Default is `false`.




## Examples

### Output basic sample data with boolean values

```js
import "sampledata"

sampledata.bool()

```

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#### Output data

| _time                | *tag | _value  |
| -------------------- | ---- | ------- |
| 2021-01-01T00:00:00Z | t1   | true    |
| 2021-01-01T00:00:10Z | t1   | true    |
| 2021-01-01T00:00:20Z | t1   | false   |
| 2021-01-01T00:00:30Z | t1   | true    |
| 2021-01-01T00:00:40Z | t1   | false   |
| 2021-01-01T00:00:50Z | t1   | false   |

| _time                | *tag | _value  |
| -------------------- | ---- | ------- |
| 2021-01-01T00:00:00Z | t2   | false   |
| 2021-01-01T00:00:10Z | t2   | true    |
| 2021-01-01T00:00:20Z | t2   | false   |
| 2021-01-01T00:00:30Z | t2   | true    |
| 2021-01-01T00:00:40Z | t2   | true    |
| 2021-01-01T00:00:50Z | t2   | false   |

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