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terraform/website/docs/configuration/functions/coalescelist.html.md

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functions coalescelist function docs-funcs-collection-coalescelist The coalescelist function takes any number of list arguments and returns the first one that isn't empty.

coalescelist Function

coalescelist takes any number of list arguments and returns the first one that isn't empty.

Examples

> coalesce(["a", "b"], ["c", "d"])
[
  "a",
  "b",
]
> coalesce([], ["c", "d"])
[
  "c",
  "d",
]

To perform the coalesce operation with a list of lists, use the ... symbol to expand the outer list as arguments:

> coalesce([[], ["c", "d"]]...)
[
  "c",
  "d",
]

Related Functions

  • coalesce performs a similar operation with string arguments rather than list arguments.