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flatten Function
Note: This page is about Terraform 0.12 and later. For Terraform 0.11 and earlier, see 0.11 Configuration Language: Interpolation Syntax.
flatten takes a list and replaces any elements that are lists with a
flattened sequence of the list contents.
» Examples
> flatten([["a", "b"], [], ["c"]])
["a", "b", "c"]
If any of the nested lists also contain directly-nested lists, these too are flattened recursively:
> flatten([[["a", "b"], []], ["c"]])
["a", "b", "c"]
Indirectly-nested lists, such as those in maps, are not flattened.