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Document sensitivity + function call behavior

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Pam Selle 2020-12-14 15:38:47 -05:00
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website/docs/configuration/expressions/function-calls.html.md
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The expansion symbol is three periods (`...`), not a Unicode ellipsis character The expansion symbol is three periods (`...`), not a Unicode ellipsis character
(`…`). Expansion is a special syntax that is only available in function calls. (`…`). Expansion is a special syntax that is only available in function calls.
## Using Sensitive Data as Function Arguments
When using sensitive data, such as [an input variable](https://www.terraform.io/docs/configuration/variables.html#suppressing-values-in-cli-output)
or [an output defined](https://www.terraform.io/docs/configuration/outputs.html#sensitive-suppressing-values-in-cli-output) as sensitive
as function arguments, the result of the function call will be marked as sensitive.
This is a conservative behavior that is true irrespective of the function being
called. For example, passing an object containing a sensitive input variable to
the `keys()` function will result in a list that is sensitive:
```shell
> local.baz
{
"a" = (sensitive)
"b" = "dog"
}
> keys(local.baz)
(sensitive)
```
## When Terraform Calls Functions ## When Terraform Calls Functions
Most of Terraform's built-in functions are, in programming language terms, Most of Terraform's built-in functions are, in programming language terms,