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| layout | page_title | sidebar_current | description |
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| language | Functions - Configuration Language | docs-config-functions | 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
-> Note: This page is about Terraform 0.12 and later. For Terraform 0.11 and earlier, see 0.11 Configuration Language: Interpolation Syntax.
Hands-on: Try the Perform Dynamic Operations with Functions tutorial on HashiCorp Learn.
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:
max(5, 12, 9)
For more details on syntax, see Function Calls in the Expressions section.
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 for this section 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:
> 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.