terraform/website/docs/configuration/functions/concat.html.md

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---
layout: "functions"
page_title: "concat - Functions - Configuration Language"
sidebar_current: "docs-funcs-collection-concat"
description: |-
The concat function combines two or more lists into a single list.
---
# `concat` Function
-> **Note:** This page is about Terraform 0.12 and later. For Terraform 0.11 and
earlier, see
[0.11 Configuration Language: Interpolation Syntax](../../configuration-0-11/interpolation.html).
`concat` takes two or more lists and combines them into a single list.
## Examples
```
> concat(["a", ""], ["b", "c"])
[
"a",
"",
"b",
"c",
]
```