docs-v2/content/flux/v0.x/stdlib/strings/joinstr.md

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---
title: strings.joinStr() function
description: >
The strings.joinStr() function concatenates the elements of a string array into
a single string using a specified separator.
aliases:
- /influxdb/v2.0/reference/flux/functions/strings/joinstr/
- /influxdb/v2.0/reference/flux/stdlib/strings/joinstr/
- /influxdb/cloud/reference/flux/stdlib/strings/joinstr/
menu:
flux_0_x_ref:
name: strings.joinStr
parent: strings
weight: 301
introduced: 0.18.0
---
The `strings.joinStr()` function concatenates elements of a string array into
a single string using a specified separator.
_**Output data type:** String_
```js
import "strings"
strings.joinStr(arr: ["a", "b", "c"], v: ",")
// returns "a,b,c"
```
## Parameters
### arr {data-type="array of strings"}
The array of strings to concatenate.
### v {data-type="string"}
The separator to use in the concatenated value.
## Examples
###### Join a list of strings into a single string
```js
import "strings"
searchTags = ["tag1", "tag2", "tag3"]
strings.joinStr(arr: searchTags, v: ","))
```