46 lines
854 B
Markdown
46 lines
854 B
Markdown
---
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title: strings.hasPrefix() function
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description: The strings.hasPrefix() function indicates if a string begins with a specific prefix.
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aliases:
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- /v2.0/reference/flux/functions/strings/hasprefix/
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menu:
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v2_0_ref:
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name: strings.hasPrefix
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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/hassuffix
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---
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The `strings.hasPrefix()` function indicates if a string begins with a specified prefix.
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_**Output data type:** Boolean_
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```js
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import "strings"
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strings.hasPrefix(v: "go gopher", t: "go")
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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 string value to search.
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_**Data type:** String_
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### t
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The prefix to search for.
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_**Data type:** String_
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###### Filter based on the presence of a prefix in a column value
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```js
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import "strings"
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data
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|> filter(fn:(r) => strings.hasPrefix(v: r.metric, t: "int_" ))
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```
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