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Note: build.sh updated to make sure that test:help build action:target doesn't also call test.sh by adding `:_all` meta-target. Note: CI will need a new help-keyman-com.sh build step to deploy web engine help. Fixes: #12347
42 lines
813 B
Markdown
42 lines
813 B
Markdown
---
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title: nul (KN)
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---
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## Summary
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[`nul`](/developer/language/reference/nul) context check: Returns `true` if the length of the [`context`](/developer/language/reference/context) is less than or equal to `n` characters.
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## Syntax
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```c
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keyman.interface.nul(n, Pelem);
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```
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or
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```c
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KeymanWeb.KN(n, Pelem); // Shorthand
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```
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### Parameters
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`n`
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: Type: `number`
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: The length of `context` to check.
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`Pelem`
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: Type: `Element`
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: The element whose `context` is being examined.
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### Return Value
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`boolean`
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: `true` if the context is not longer than `n` characters, otherwise `false`.
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## Description
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This is of particular use in handling the [Developer rule `nul`](/developer/language/reference/nul) and is subject to the caveats listed therein.
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## See also
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- [`keyman.interface.context()`](context)
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