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Co-authored-by: Matthew Garrell <69917312+mgarrell777@users.noreply.github.com> Co-authored-by: Laura Pacilio <83350965+laurapacilio@users.noreply.github.com> Co-authored-by: Kevin Wang <kwangsan@gmail.com> Co-authored-by: Judith Malnick <judith@hashicorp.com> Co-authored-by: Martin Atkins <mart@degeneration.co.uk> Co-authored-by: HashiBot <62622282+hashibot-web@users.noreply.github.com>
39 lines
1.4 KiB
Plaintext
39 lines
1.4 KiB
Plaintext
---
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page_title: Functions - Configuration Language
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description: >-
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An introduction to the built-in functions that you can use to transform and
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combine values in expressions.
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---
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# Built-in Functions
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> **Hands-on:** Try the [Perform Dynamic Operations with Functions](https://learn.hashicorp.com/tutorials/terraform/functions?in=terraform/configuration-language&utm_source=WEBSITE&utm_medium=WEB_IO&utm_offer=ARTICLE_PAGE&utm_content=DOCS) tutorial.
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The Terraform language includes a number of built-in functions that you can
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call from within expressions to transform and combine values. The general
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syntax for function calls is a function name followed by comma-separated
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arguments in parentheses:
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```hcl
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max(5, 12, 9)
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```
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For more details on syntax, see
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[_Function Calls_](/language/expressions/function-calls)
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in the Expressions section.
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The Terraform language does not support user-defined functions, and so only
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the functions built in to the language are available for use. The documentation includes a page for all of the available built-in functions.
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You can experiment with the behavior of Terraform's built-in functions from
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the Terraform expression console, by running
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[the `terraform console` command](/cli/commands/console):
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```
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> max(5, 12, 9)
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12
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```
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The examples in the documentation for each function use console output to
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illustrate the result of calling the function with different parameters.
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