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30 lines
1 KiB
Markdown
30 lines
1 KiB
Markdown
---
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title: collections.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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categories: []
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keywords: []
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action:
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aliases: [intersect]
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related:
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- functions/collections/Complement
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- functions/collections/SymDiff
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- functions/collections/Union
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returnType: any
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signatures: [collections.Intersect SET1 SET2]
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aliases: [/functions/intersect]
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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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```go-html-template
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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 parameters.
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See [union](/functions/collections/union) for `OR`.
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[partials]: /templates/partials/
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[single]: /templates/single-page-templates/
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