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* lang/funcs: testing of functions through the lang package API The function-specific unit tests do not cover the HCL conversion that happens when the functions are called in a terraform configuration. For e.g., HCL converts sets to lists before passing it to the function. This means that we could not test passing a set in the function _unit_ tests. This adds a higher-level acceptance test, plus a check that every (pure) function has a test. * website/docs: update function documentation
28 lines
590 B
Markdown
28 lines
590 B
Markdown
---
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layout: "functions"
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page_title: "concat - Functions - Configuration Language"
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sidebar_current: "docs-funcs-collection-concat"
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description: |-
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The concat function combines two or more lists into a single list.
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---
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# `concat` Function
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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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`concat` takes two or more lists and combines them into a single list.
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## Examples
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```
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> concat(["a", ""], ["b", "c"])
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[
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"a",
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"",
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"b",
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"c",
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]
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```
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