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

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---
layout: "functions"
page_title: "Configuration Functions"
sidebar_current: "docs-config-functions"
description: |-
The Terraform language has a number of built-in functions that can be called
from within expressions to transform and combine values.
---
# Built-in Functions
The Terraform language includes a number of built-in functions that you can
call from within expressions to transform and combine values. The general
syntax for function calls is a function name followed by comma-separated
arguments in parentheses:
```hcl
max(5, 12, 9)
```
For more details on syntax, see
[_Function Calls_](/docs/configuration/expressions.html#function-calls)
on the Expressions page.
The Terraform language does not support user-defined functions, and so only
the functions built in to the language are available for use. The navigation
includes a list of all of the available built-in functions.
You can experiment with the behavior of Terraform's built-in functions from
the Terraform expression console, by running
[the `terraform console` command](/docs/commands/console.html):
```
> max(5, 12, 9)
12
```
The examples in the documentation for each function use console output to
illustrate the result of calling the function with different parameters.