36 lines
705 B
Markdown
36 lines
705 B
Markdown
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---
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title: "assertIs"
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subtitle: "Function in std"
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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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```kcl
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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-std/types/std-types-bool) | Value to check. If this is the boolean value true, assert passes. Otherwise it fails.. | Yes |
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| `error` | [`string`](/docs/kcl-std/types/std-types-string) | If the value was false, the program will terminate with this error message | No |
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### Examples
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```kcl
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kclIsFun = true
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assertIs(kclIsFun)
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```
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