41 lines
26 KiB
Markdown
41 lines
26 KiB
Markdown
---
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title: "assertIs"
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excerpt: "Asserts that a value is the boolean value true."
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layout: manual
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---
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Asserts that a value is the boolean value true.
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```js
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assertIs(
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actual: bool,
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error?: String,
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): ()
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```
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### Arguments
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| Name | Type | Description | Required |
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|----------|------|-------------|----------|
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| `actual` | [`bool`](/docs/kcl/types/bool) | Value to check. If this is the boolean value true, assert passes. Otherwise it fails. | Yes |
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| `error` | `String` | If the value was false, the program will terminate with this error message | No |
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### Returns
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`()`
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### Examples
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```js
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kclIsFun = true
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assertIs(kclIsFun)
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```
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