43 lines
764 B
Markdown
43 lines
764 B
Markdown
---
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title: strings.isLower() function
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description: The strings.isLower() function tests if a single-character string is lowercase.
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aliases:
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- /v2.0/reference/flux/functions/strings/islower/
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menu:
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v2_0_ref:
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name: strings.isLower
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parent: Strings
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weight: 301
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related:
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- /v2.0/reference/flux/stdlib/strings/isupper
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---
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The `strings.isLower()` function tests if a single-character string is lowercase.
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_**Output data type:** Boolean_
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```js
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import "strings"
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strings.isLower(v: "a")
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// returns true
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```
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## Parameters
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### v
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The single-character string value to test.
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_**Data type:** String_
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## Examples
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###### Filter by columns with single-letter lowercase values
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```js
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import "strings"
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data
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|> filter(fn: (r) => strings.isLower(v: r.host))
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```
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