56 lines
991 B
Markdown
56 lines
991 B
Markdown
---
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title: strings.substring() function
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description: >
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The strings.substring() function returns a substring based on `start` and `end` parameters.
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Indices are based on UTF code points.
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menu:
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v2_0_ref:
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name: strings.substring
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parent: Strings
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weight: 301
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---
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The `strings.substring()` function returns a substring based on `start` and `end` parameters.
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These parameters are represent indices of UTF code points in the string.
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_**Output data type:** String_
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```js
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import "strings"
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strings.substring(v: "influx", start: 0, end: 3)
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// returns "infl"
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```
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## Parameters
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### v
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The string value to search.
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_**Data type:** String_
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### start
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The starting index of the substring.
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_**Data type:** Integer_
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### end
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The ending index of the substring.
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_**Data type:** Integer_
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## Examples
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###### Store the first four characters of a string
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```js
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import "strings"
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data
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|> map(fn: (r) => ({
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r with
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abbr: strings.substring(v: r.name, start: 0, end: 3)
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})
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)
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```
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