163 lines
4.6 KiB
Markdown
163 lines
4.6 KiB
Markdown
---
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title: strings.strlen() function
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description: >
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`strings.strlen()` returns the length of a string. String length is determined by the number of UTF code points a string contains.
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menu:
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flux_v0_ref:
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name: strings.strlen
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parent: strings
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identifier: strings/strlen
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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#L811-L811
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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.strlen()` returns the length of a string. String length is determined by the number of UTF code points a string contains.
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##### Function type signature
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```js
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(v: string) => int
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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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String value to measure.
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## Examples
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- [Filter based on string value length](#filter-based-on-string-value-length)
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- [Store the length of string values](#store-the-length-of-string-values)
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### Filter based on string value length
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```js
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import "strings"
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data
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|> filter(fn: (r) => strings.strlen(v: r._value) <= 6)
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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 | _value | *tag |
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| -------------------- | -------- | ---- |
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| 2021-01-01T00:00:00Z | pl_gqcz | t1 |
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| 2021-01-01T00:00:10Z | pl_gvn | t1 |
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| 2021-01-01T00:00:20Z | pl_phw | t1 |
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| 2021-01-01T00:00:30Z | pl_guvzy | t1 |
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| 2021-01-01T00:00:40Z | pl_vcce | t1 |
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| 2021-01-01T00:00:50Z | pl_fgy | t1 |
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| _time | _value | *tag |
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| -------------------- | -------- | ---- |
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| 2021-01-01T00:00:00Z | pl_beida | t2 |
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| 2021-01-01T00:00:10Z | pl_euoxp | t2 |
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| 2021-01-01T00:00:20Z | pl_gtz | t2 |
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| 2021-01-01T00:00:30Z | pl_oxut | t2 |
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| 2021-01-01T00:00:40Z | pl_wf | t2 |
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| 2021-01-01T00:00:50Z | pl_dtnbv | t2 |
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#### Output data
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| _time | _value | *tag |
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| -------------------- | ------- | ---- |
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| 2021-01-01T00:00:10Z | pl_gvn | t1 |
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| 2021-01-01T00:00:20Z | pl_phw | t1 |
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| 2021-01-01T00:00:50Z | pl_fgy | t1 |
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| _time | _value | *tag |
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| -------------------- | ------- | ---- |
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| 2021-01-01T00:00:20Z | pl_gtz | t2 |
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| 2021-01-01T00:00:40Z | pl_wf | t2 |
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{{% /expand %}}
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{{< /expand-wrapper >}}
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### Store the length of string values
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```js
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import "strings"
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data
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|> map(fn: (r) => ({r with length: strings.strlen(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 | _value | *tag |
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| -------------------- | -------- | ---- |
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| 2021-01-01T00:00:00Z | pl_gqcz | t1 |
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| 2021-01-01T00:00:10Z | pl_gvn | t1 |
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| 2021-01-01T00:00:20Z | pl_phw | t1 |
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| 2021-01-01T00:00:30Z | pl_guvzy | t1 |
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| 2021-01-01T00:00:40Z | pl_vcce | t1 |
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| 2021-01-01T00:00:50Z | pl_fgy | t1 |
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| _time | _value | *tag |
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| -------------------- | -------- | ---- |
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| 2021-01-01T00:00:00Z | pl_beida | t2 |
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| 2021-01-01T00:00:10Z | pl_euoxp | t2 |
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| 2021-01-01T00:00:20Z | pl_gtz | t2 |
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| 2021-01-01T00:00:30Z | pl_oxut | t2 |
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| 2021-01-01T00:00:40Z | pl_wf | t2 |
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| 2021-01-01T00:00:50Z | pl_dtnbv | t2 |
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#### Output data
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| _time | _value | length | *tag |
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| -------------------- | -------- | ------- | ---- |
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| 2021-01-01T00:00:00Z | pl_gqcz | 7 | t1 |
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| 2021-01-01T00:00:10Z | pl_gvn | 6 | t1 |
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| 2021-01-01T00:00:20Z | pl_phw | 6 | t1 |
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| 2021-01-01T00:00:30Z | pl_guvzy | 8 | t1 |
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| 2021-01-01T00:00:40Z | pl_vcce | 7 | t1 |
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| 2021-01-01T00:00:50Z | pl_fgy | 6 | t1 |
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| _time | _value | length | *tag |
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| -------------------- | -------- | ------- | ---- |
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| 2021-01-01T00:00:00Z | pl_beida | 8 | t2 |
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| 2021-01-01T00:00:10Z | pl_euoxp | 8 | t2 |
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| 2021-01-01T00:00:20Z | pl_gtz | 6 | t2 |
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| 2021-01-01T00:00:30Z | pl_oxut | 7 | t2 |
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| 2021-01-01T00:00:40Z | pl_wf | 5 | t2 |
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| 2021-01-01T00:00:50Z | pl_dtnbv | 8 | t2 |
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{{% /expand %}}
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{{< /expand-wrapper >}}
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