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44 lines
1.5 KiB
Markdown
44 lines
1.5 KiB
Markdown
---
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layout: "language"
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page_title: "Functions - Configuration Language"
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sidebar_current: "docs-config-functions"
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description: |-
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The Terraform language has a number of built-in functions that can be called
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from within expressions to transform and combine values.
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---
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# Built-in Functions
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-> **Note:** This page is about Terraform 0.12 and later. For Terraform 0.11 and
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earlier, see
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[0.11 Configuration Language: Interpolation Syntax](../configuration-0-11/interpolation.html).
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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_](/docs/configuration/expressions/function-calls.html)
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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 navigation
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for this section includes a list of 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](/docs/commands/console.html):
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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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