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packer/website/source/docs/configuration/from-1.5/functions.html.md

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docs Functions - Configuration Language configuration-functions 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:

max(5, 12, 9)

For more details on syntax, see Function Calls on the Expressions page.

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.