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37 lines
1 KiB
Markdown
37 lines
1 KiB
Markdown
---
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title: intersect
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linktitle: intersect
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description: Returns the common elements of two arrays or slices, in the same order as the first array.
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date: 2017-02-01
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publishdate: 2017-02-01
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lastmod: 2017-02-01
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categories: [functions]
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menu:
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docs:
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parent: "functions"
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keywords: [collections,intersect,union,complement,symdiff]
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signature: ["intersect SET1 SET2"]
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workson: []
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hugoversion:
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relatedfuncs: []
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deprecated: false
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aliases: []
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---
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A useful example is to use it as `AND` filters when combined with where:
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## AND filter in where query
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```
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{{ $pages := where .Site.RegularPages "Type" "not in" (slice "page" "about") }}
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{{ $pages := $pages | union (where .Site.RegularPages "Params.pinned" true) }}
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{{ $pages := $pages | intersect (where .Site.RegularPages "Params.images" "!=" nil) }}
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```
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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.
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See [union](/functions/union) for `OR`.
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[partials]: /templates/partials/
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[single]: /templates/single-page-templates/
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