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

42 lines
968 B
Markdown
Raw Normal View History

---
layout: "language"
page_title: "coalesce - Functions - Configuration Language"
sidebar_current: "docs-funcs-collection-coalesce-x"
description: |-
The coalesce function takes any number of arguments and returns the
first one that isn't null nor empty.
---
# `coalesce` 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).
`coalesce` takes any number of arguments and returns the first one
that isn't null or an empty string.
## Examples
```
> coalesce("a", "b")
a
> coalesce("", "b")
b
> coalesce(1,2)
1
```
To perform the `coalesce` operation with a list of strings, use the `...`
symbol to expand the list as arguments:
```
> coalesce(["", "b"]...)
b
```
## Related Functions
* [`coalescelist`](./coalescelist.html) performs a similar operation with
list arguments rather than individual arguments.