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lang/functions: set functions from cty The sethaselement, setintersection, and setunion functions are defined in the cty stdlib. Making them available in Terraform will make it easier to work with sets, and complement the currently-Terraform-specific setproduct function. In the long run setproduct should probably move into the cty stdlib too, but since it was submitted as a Terraform function originally we'll leave it here now for simplicity's sake and reorganize later.
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---
layout: "functions"
page_title: "setunion - Functions - Configuration Language"
sidebar_current: "docs-funcs-collection-setunion"
description: |-
The setunion function takes multiple sets and produces a single set
containing the elements from all of the given sets.
---
# `setunion` Function
website: Version notes: Add new -> old links to 0.12 language docs (function pages)
2019-01-17 01:33:57 +01:00
-> **Note:** This page is about Terraform 0.12 and later. For Terraform 0.11 and
earlier, see
[0.11 Configuration Language: Interpolation Syntax](../../configuration-0-11/interpolation.html).
lang/functions: set functions from cty The sethaselement, setintersection, and setunion functions are defined in the cty stdlib. Making them available in Terraform will make it easier to work with sets, and complement the currently-Terraform-specific setproduct function. In the long run setproduct should probably move into the cty stdlib too, but since it was submitted as a Terraform function originally we'll leave it here now for simplicity's sake and reorganize later.
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The `setunion` function takes multiple sets and produces a single set
containing the elements from all of the given sets. In other words, it
computes the [union](https://en.wikipedia.org/wiki/Union_(set_theory)) of
the sets.
```hcl
setunion(sets...)
```
## Examples
```
> setunion(["a", "b"], ["b", "c"], ["d"])
[
"d",
"b",
"c",
"a",
]
```
The given arguments are converted to sets, so the result is also a set and
the ordering of the given elements is not preserved.
## Related Functions
lang/funcs: remove sethaselement function and documentation (#21164) `contains` and `sethaselement` are effectively the same function, and `contains` works with `sets` thanks to automatic HCL conversion.
2019-05-02 16:47:19 +02:00
* [`contains`](./contains.html) tests whether a given list or set contains
lang/functions: set functions from cty The sethaselement, setintersection, and setunion functions are defined in the cty stdlib. Making them available in Terraform will make it easier to work with sets, and complement the currently-Terraform-specific setproduct function. In the long run setproduct should probably move into the cty stdlib too, but since it was submitted as a Terraform function originally we'll leave it here now for simplicity's sake and reorganize later.
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a given element value.
* [`setintersection`](./setintersection.html) computes the _intersection_ of
multiple sets.
docs: Minor spelling and typo fixes
2019-09-05 19:08:34 +02:00
* [`setproduct`](./setproduct.html) computes the _Cartesian product_ of multiple
lang/functions: set functions from cty The sethaselement, setintersection, and setunion functions are defined in the cty stdlib. Making them available in Terraform will make it easier to work with sets, and complement the currently-Terraform-specific setproduct function. In the long run setproduct should probably move into the cty stdlib too, but since it was submitted as a Terraform function originally we'll leave it here now for simplicity's sake and reorganize later.
2019-01-15 20:51:21 +01:00
sets.
lang: add setsubtract function (#23424) * add setdifference and setsubtract functions and docs * remove setdifference as it is not implemented correct in underlying lib * Update setintersection.html.md * Update setproduct.html.md * Update setunion.html.md
2020-02-06 18:49:11 +01:00
* [`setsubtract`](./setsubtract.html) computes the _relative complement_ of two sets