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opentofu/website/docs/configuration/functions/concat.html.md
Kristin Laemmert 394cf7f25e
lang/funcs: add acc tests for functions (#21112) 
* 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
2019-04-29 13:11:28 -04:00

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functions concat - Functions - Configuration Language docs-funcs-collection-concat The concat function combines two or more lists into a single list.

concat Function

-> Note: This page is about Terraform 0.12 and later. For Terraform 0.11 and earlier, see 0.11 Configuration Language: Interpolation Syntax.

concat takes two or more lists and combines them into a single list.

Examples

> concat(["a", ""], ["b", "c"])
[
  "a",
  "",
  "b",
  "c",
]