open-nomad/website/content/docs/job-specification/hcl2/functions/index.mdx

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---
layout: docs
page_title: Functions - Configuration Language
description: |-
The HCL language has a number of built-in functions that can be called
from within expressions to transform and combine values.
---
# Built-in Functions
The HCL 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)
```
HCL functions are executed on job submission and cannot be combined with client
side interpolation.
The HCL language does not support user-defined functions, and so only
the functions built in to the language are available for use. The navigation
for this section includes a list of all of the available built-in functions.