101 lines
2.5 KiB
Markdown
101 lines
2.5 KiB
Markdown
---
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title: strings.isUpper() function
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description: >
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`strings.isUpper()` tests if a single character string is uppercase.
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menu:
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flux_v0_ref:
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name: strings.isUpper
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parent: strings
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identifier: strings/isUpper
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weight: 101
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---
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<!------------------------------------------------------------------------------
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IMPORTANT: This page was generated from comments in the Flux source code. Any
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edits made directly to this page will be overwritten the next time the
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documentation is generated.
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To make updates to this documentation, update the function comments above the
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function definition in the Flux source code:
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https://github.com/influxdata/flux/blob/master/stdlib/strings/strings.flux#L606-L606
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Contributing to Flux: https://github.com/influxdata/flux#contributing
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Fluxdoc syntax: https://github.com/influxdata/flux/blob/master/docs/fluxdoc.md
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------------------------------------------------------------------------------->
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`strings.isUpper()` tests if a single character string is uppercase.
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##### Function type signature
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```js
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(v: string) => bool
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```
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{{% caption %}}
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For more information, see [Function type signatures](/flux/v0/function-type-signatures/).
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{{% /caption %}}
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## Parameters
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### v
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({{< req >}})
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Single-character string value to test.
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## Examples
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### Filter by columns with single-letter uppercase 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.isUpper(v: r._value))
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```
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{{< expand-wrapper >}}
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{{% expand "View example input and output" %}}
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#### Input data
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| _time | *tag | _value |
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| -------------------- | ---- | ------- |
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| 2022-01-01T00:00:00Z | t1 | a |
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| 2022-01-01T00:01:00Z | t1 | B |
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| 2022-01-01T00:02:00Z | t1 | C |
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| 2022-01-01T00:03:00Z | t1 | d |
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| 2022-01-01T00:04:00Z | t1 | e |
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| _time | *tag | _value |
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| -------------------- | ---- | ------- |
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| 2022-01-01T00:00:00Z | t2 | F |
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| 2022-01-01T00:01:00Z | t2 | g |
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| 2022-01-01T00:02:00Z | t2 | H |
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| 2022-01-01T00:03:00Z | t2 | i |
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| 2022-01-01T00:04:00Z | t2 | J |
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#### Output data
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| _time | *tag | _value |
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| -------------------- | ---- | ------- |
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| 2022-01-01T00:01:00Z | t1 | B |
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| 2022-01-01T00:02:00Z | t1 | C |
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| _time | *tag | _value |
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| -------------------- | ---- | ------- |
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| 2022-01-01T00:00:00Z | t2 | F |
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| 2022-01-01T00:02:00Z | t2 | H |
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| 2022-01-01T00:04:00Z | t2 | J |
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{{% /expand %}}
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{{< /expand-wrapper >}}
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