hugo/docs/content/en/functions/intersect.md

---
title: intersect
linktitle: intersect
description: Returns the common elements of two arrays or slices.
godocref:
date: 2017-02-01
publishdate: 2017-02-01
lastmod: 2017-02-01
categories: [functions]
menu:
  docs:
    parent: "functions"
keywords: [collections,intersect,union,complement,symdiff]
signature: ["intersect SET1 SET2"]
workson: []
hugoversion:
relatedfuncs: []
deprecated: false
aliases: []
---
An useful example is to use it as `AND` filters when combined with where:

## AND filter in where query

```
{{ $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 [union](/functions/union) for `OR`.


[partials]: /templates/partials/
[single]: /templates/single-page-templates/
Squashed 'docs/' content from commit f887bd7b git-subtree-dir: docs git-subtree-split: f887bd7b4e3e7c7e76cd63951e5b0d37d8fe0ac7 2017-08-10 11:18:22 -04:00			`---`
			`title: intersect`
			`linktitle: intersect`
			`description: Returns the common elements of two arrays or slices.`
			`godocref:`
			`date: 2017-02-01`
			`publishdate: 2017-02-01`
			`lastmod: 2017-02-01`
			`categories: [functions]`
			`menu:`
			`docs:`
			`parent: "functions"`
Squashed 'docs/' changes from 37095d540..d1cf9adc4 d1cf9adc4 Fix typo 26e10a690 Fix the name and arg mismatch between partial defn and call 2db0e53cd Merge commit '9c36cff15224f6cbd19058ad61311229b7a23c83' 9c36cff15 Squashed 'themes/gohugoioTheme/' changes from 68ddff44..b8202f53 4b021eff8 Update lang.Merge.md b37af2916 Add title to yaml a9a281233 Fixed incorrect usage of the code-toggle shortcode 4560a0169 Update Warning for Theme Links (#676) 0305e3c6b Document .File.ContentBaseName 6d30c5aa1 Update configuration.md 158df174a Document .Sites and .Sites.First 0c0f583b8 Add stale config e2531afd8 Document path template functions 4dd779057 Clarify that partialCached is per site/language 19e5bbe0c Update index.md 44b000857 Add missing dot a41300cf9 Release 0.52 2d1d92b88 Merge branch 'temp52' c5925250d releaser: Prepare repository for 0.53-DEV d000b04a2 releaser: Add release notes to /docs for release of 0.52 4bb983a0a releaser: Bump versions for release of 0.52 36736ca28 tpl: Add "param" shortcode 378677aa6 Add Elasticsearch/bonsai.io to services doc. 4c3fd4fa4 docs: Document inline shortcodes 6c64c374c Whitelist CSS modules from purge 817a872b9 Improve search icon position cf86ff1c7 Add minification and resource cache clear to build command fd77e8df3 Update asset dependencies and adopt Hugo Pipes cdbe97e8c Update render.md b0e279220 git command to update submodule to latest a1cb98c12 cache/filecache: Add a :project placeholder 07c1b2b46 cache/filecache: Use time.Duration for maxAge ffa9b165e Add AND as a title 6e7733b40 Add OR as a sub title to make it easier to find in search 72b6791a1 docs: Document the new file cache 714d3ca91 Fix minification issues cd1e961da Revert "Add Elasticsearch/bonsai.io to services doc." 15a0cda6e Add Elasticsearch/bonsai.io to services doc. f931d86de Release 0.51 e2ffe867a Merge branch 'temp51' 423e7f5c8 releaser: Prepare repository for 0.52-DEV c6f2d6ae1 releaser: Add release notes to /docs for release of 0.51 5bbb556dc releaser: Bump versions for release of 0.51 3b2b172b9 docs: Document shortcode error handling b8672f3d4 docs: Document symdiff 4bc6071e6 docs: Document complement d1baab752 docs: Re-generate CLI docs 9ea667e24 Revert "tpl: Update Jsonify to return pretty-print output" ce5a1403d docs: Regenerate the docs helper 99a1f4a94 Fix note for reserved partial name(starting with -> including). eba3cbc42 fix accidentally modification on paragraph. 3eebd98c3 Add note for reserved partial name. 40b881cc2 Document templates.Exists b5c3bcd3b Update multilingual.md 61c59c67e Fix misspelling (#648) f21d8c4a4 Correct minor typo (#5372) e967001b9 Release 0.50 685fd6b08 releaser: Prepare repository for 0.51-DEV f245a9faa releaser: Add release notes to /docs for release of 0.50 4354da30d releaser: Bump versions for release of 0.50 feaa05469 docs: Regenerate CLI docs 5c724200c Merge commit 'd6a4af7018e8618944a6471ceeb7aae1d4df6afa' 2ddab36c2 Merge commit '74309fe5699a595080fdb3a14711e0869babce99' 8cf296a7c docs: Regenerate CLI docs 9097683dd tpl: Update Jsonify to return pretty-print output git-subtree-dir: docs git-subtree-split: d1cf9adc412245c96d9d32592a903370d3972aef 2018-12-12 03:05:31 -05:00			`keywords: [collections,intersect,union,complement,symdiff]`
Squashed 'docs/' content from commit f887bd7b git-subtree-dir: docs git-subtree-split: f887bd7b4e3e7c7e76cd63951e5b0d37d8fe0ac7 2017-08-10 11:18:22 -04:00			`signature: ["intersect SET1 SET2"]`
			`workson: []`
			`hugoversion:`
			`relatedfuncs: []`
			`deprecated: false`
			`aliases: []`
			`---`
Squashed 'docs/' changes from 9b494a58c..6b00298bb 6b00298bb Remove outdated "related example" 987f1e1cd Fix dead links (#601) 96287a20a Add config option "summaryLength" (#600) ced7f2085 Adjust Over showcase e334a6354 Add new showcase: over 10435b502 Add warning about privacy options only work with internal templates (#525) 48c6b0e4d Minor grammatical fix 684670ebc Add quote 0e9fada52 Improvements to taxonomy template examples e06c4bf73 Add syntax highlighting; consistent 4-space indentation c1cb3f081 Remove dead links for custom permalinks 3e3aefd04 Fix 0a671bc3751479e74a0a9d2132736c61d239707c d65888685 fix file name in 'Add Non-content Entries to a Menu' code toggle (#547) 1a0563857 Add Solus install guide (#590) 8a0d65b0d Update Windows Installation instructions (#564) c4348636a Fix typo 0a671bc37 Add post to menu example af14497c6 Add notes for `os.Stat` (Hugo 0.47) (#557) e49f65bb3 Singular to plural cb5608dbf Update introduction.md 30b060dff Add variable re-definition example (Hugo v0.48+) 21123967e Minor edits fac3df043 Refresh the Go Templates introduction 4a9600e92 Updating URL to how-to-guide for hosting hugo site on firebase bfaa7779c add missing word c2cb5d09b Tweak 'name: weight' to 'name: date' in example (#582) 5ea938ad6 Remove some Scratch 2708dcd57 Release 0.48 e375d0f05 Merge branch 'temp48' 75e36c160 releaser: Prepare repository for 0.49-DEV a6102f253 releaser: Add release notes to /docs for release of 0.48 41fc35db4 releaser: Bump versions for release of 0.48 64b9ecc74 Spell out the npm command for installing PostCSS 19e900a17 Improved Related Content doc fe21600e7 Merge commit '844aef544c19e9d8f529b4f8144e089d0982bb34' 844aef544 Squashed 'themes/gohugoioTheme/' changes from 66249819..68ddff44 069828db8 Update git.md d881d1433 Make default "related" behavior more explicit 60b9160eb Add docs for displaying 404 page on CloudFront b72ebc760 Add .gitattributes to /resources 000cf85f4 Make the pros/cons styling consistent for summaries; use desc list ebf1da97a Add note about outputStyle compressed e3338ee91 Triple backquote syntax fix 361962a7c Add one more Blogger to Hugo tool for Windows (.NET Framework 4.5) (#540) 066606a21 Fix wrong link about Mmark Syntax Document faee70757 Added exitwp-for-hugo 6b4108051 Add hugo-wrapper to starter-kits 4695dfba2 Added Utterances as Comments Alternatives. c7ba9e3e1 Correct typo beb850d9f Release 0.47.1 1cf417c8a Merge branch 'temp471' 0843bc46c releaser: Prepare repository for 0.48-DEV 8ff5c8b70 releaser: Add release notes to /docs for release of 0.47.1 e2353434d releaser: Bump versions for release of 0.47.1 ffb1300af Update development.md c22234ea5 netlify: Minify output 5b9191c56 Release 0.47 bfd92cf52 releaser: Prepare repository for 0.48-DEV ac7acf730 releaser: Add release notes to /docs for release of 0.47 b0096099d releaser: Bump versions for release of 0.47 86a7ae459 docs: Regenerate CLI docs d2c8b72bc Merge commit 'a95896878f4b4a79448b39ce93a4e0d3258b4a43' 84de7ef59 Merge commit '3a44bf182fed5f34621f450114083a6dd7e88a07' git-subtree-dir: docs git-subtree-split: 6b00298bb26b700281df28817b6556e7480cdd1e 2018-09-14 02:34:58 -04:00			An useful example is to use it as `AND` filters when combined with where:
Squashed 'docs/' content from commit f887bd7b git-subtree-dir: docs git-subtree-split: f887bd7b4e3e7c7e76cd63951e5b0d37d8fe0ac7 2017-08-10 11:18:22 -04:00
Squashed 'docs/' changes from 37095d540..d1cf9adc4 d1cf9adc4 Fix typo 26e10a690 Fix the name and arg mismatch between partial defn and call 2db0e53cd Merge commit '9c36cff15224f6cbd19058ad61311229b7a23c83' 9c36cff15 Squashed 'themes/gohugoioTheme/' changes from 68ddff44..b8202f53 4b021eff8 Update lang.Merge.md b37af2916 Add title to yaml a9a281233 Fixed incorrect usage of the code-toggle shortcode 4560a0169 Update Warning for Theme Links (#676) 0305e3c6b Document .File.ContentBaseName 6d30c5aa1 Update configuration.md 158df174a Document .Sites and .Sites.First 0c0f583b8 Add stale config e2531afd8 Document path template functions 4dd779057 Clarify that partialCached is per site/language 19e5bbe0c Update index.md 44b000857 Add missing dot a41300cf9 Release 0.52 2d1d92b88 Merge branch 'temp52' c5925250d releaser: Prepare repository for 0.53-DEV d000b04a2 releaser: Add release notes to /docs for release of 0.52 4bb983a0a releaser: Bump versions for release of 0.52 36736ca28 tpl: Add "param" shortcode 378677aa6 Add Elasticsearch/bonsai.io to services doc. 4c3fd4fa4 docs: Document inline shortcodes 6c64c374c Whitelist CSS modules from purge 817a872b9 Improve search icon position cf86ff1c7 Add minification and resource cache clear to build command fd77e8df3 Update asset dependencies and adopt Hugo Pipes cdbe97e8c Update render.md b0e279220 git command to update submodule to latest a1cb98c12 cache/filecache: Add a :project placeholder 07c1b2b46 cache/filecache: Use time.Duration for maxAge ffa9b165e Add AND as a title 6e7733b40 Add OR as a sub title to make it easier to find in search 72b6791a1 docs: Document the new file cache 714d3ca91 Fix minification issues cd1e961da Revert "Add Elasticsearch/bonsai.io to services doc." 15a0cda6e Add Elasticsearch/bonsai.io to services doc. f931d86de Release 0.51 e2ffe867a Merge branch 'temp51' 423e7f5c8 releaser: Prepare repository for 0.52-DEV c6f2d6ae1 releaser: Add release notes to /docs for release of 0.51 5bbb556dc releaser: Bump versions for release of 0.51 3b2b172b9 docs: Document shortcode error handling b8672f3d4 docs: Document symdiff 4bc6071e6 docs: Document complement d1baab752 docs: Re-generate CLI docs 9ea667e24 Revert "tpl: Update Jsonify to return pretty-print output" ce5a1403d docs: Regenerate the docs helper 99a1f4a94 Fix note for reserved partial name(starting with -> including). eba3cbc42 fix accidentally modification on paragraph. 3eebd98c3 Add note for reserved partial name. 40b881cc2 Document templates.Exists b5c3bcd3b Update multilingual.md 61c59c67e Fix misspelling (#648) f21d8c4a4 Correct minor typo (#5372) e967001b9 Release 0.50 685fd6b08 releaser: Prepare repository for 0.51-DEV f245a9faa releaser: Add release notes to /docs for release of 0.50 4354da30d releaser: Bump versions for release of 0.50 feaa05469 docs: Regenerate CLI docs 5c724200c Merge commit 'd6a4af7018e8618944a6471ceeb7aae1d4df6afa' 2ddab36c2 Merge commit '74309fe5699a595080fdb3a14711e0869babce99' 8cf296a7c docs: Regenerate CLI docs 9097683dd tpl: Update Jsonify to return pretty-print output git-subtree-dir: docs git-subtree-split: d1cf9adc412245c96d9d32592a903370d3972aef 2018-12-12 03:05:31 -05:00			`## AND filter in where query`

Squashed 'docs/' content from commit f887bd7b git-subtree-dir: docs git-subtree-split: f887bd7b4e3e7c7e76cd63951e5b0d37d8fe0ac7 2017-08-10 11:18:22 -04:00			```
			`{{ $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 [union](/functions/union) for `OR`.


			`[partials]: /templates/partials/`
			`[single]: /templates/single-page-templates/`