mirror of
https://github.com/gohugoio/hugo.git
synced 2024-11-30 02:23:33 -05:00
51 lines
1.5 KiB
Markdown
51 lines
1.5 KiB
Markdown
|
---
|
||
|
|
title: union
|
||
|
|
# linktitle: union
|
||
|
|
description: Given two arrays or slices, returns a new array that contains the elements or objects that belong to either or both arrays/slices.
|
||
|
|
godocref:
|
||
|
|
date: 2017-02-01
|
||
|
|
publishdate: 2017-02-01
|
||
|
|
lastmod: 2017-03-12
|
||
|
|
categories: [functions]
|
||
|
|
menu:
|
||
|
|
docs:
|
||
|
|
parent: "functions"
|
||
|
|
keywords: [filtering,lists]
|
||
|
|
signature: ["union SET1 SET2"]
|
||
|
|
workson: []
|
||
|
|
hugoversion: 0.20
|
||
|
|
relatedfuncs: [intersect,where]
|
||
|
|
deprecated: false
|
||
|
|
aliases: []
|
||
|
|
---
|
||
|
|
|
||
|
|
Given two arrays (or slices) A and B, this function will return a new array that contains the elements or objects that belong to either A or to B or to both. The elements supported are strings, integers, and floats (only float64).
|
||
|
|
|
||
|
|
```
|
||
|
|
{{ union (slice 1 2 3) (slice 3 4 5) }}
|
||
|
|
<!-- returns [1 2 3 4 5] -->
|
||
|
|
|
||
|
|
{{ union (slice 1 2 3) nil }}
|
||
|
|
<!-- returns [1 2 3] -->
|
||
|
|
|
||
|
|
{{ union nil (slice 1 2 3) }}
|
||
|
|
<!-- returns [1 2 3] -->
|
||
|
|
|
||
|
|
{{ union nil nil }}
|
||
|
|
<!-- returns an error because both arrays/slices have to be of the same type -->
|
||
|
|
```
|
||
|
|
|
||
|
|
## OR filter in where query
|
||
|
|
|
||
|
|
This is also very useful to use as `OR` filters when combined with where:
|
||
|
|
|
||
|
|
```
|
||
|
|
{{ $pages := where .Site.RegularPages "Type" "not in" (slice "page" "about") }}
|
||
|
|
{{ $pages := $pages | union (where .Site.RegularPages "Params.pinned" true) }}
|
||
|
|
{{ $pages := $pages | intersect (where .Site.RegularPages "Params.images" "!=" nil) }}
|
||
|
|
```
|
||
|
|
|
||
|
|
The above fetches regular pages not of `page` or `about` type unless they are pinned. And finally, we exclude all pages with no `images` set in Page params.
|
||
|
|
|
||
|
|
See [intersect](/functions/intersect) for `AND`.
|