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57 lines
1.8 KiB
Markdown
57 lines
1.8 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.
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godocref:
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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: []
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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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The elements supported are strings, integers, and floats (only float64).
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A useful example of `intersect` functionality is a "related posts" block. `isset` allows us to create a list of links to other posts that have tags that intersect with the tags in the current post.
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The following is an example of a "related posts" [partial template][partials] that could be added to a [single page template][single]:
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{{< code file="layouts/partials/related-posts.html" download="related-posts.html" >}}
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<ul>
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{{ $page_link := .Permalink }}
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{{ $tags := .Params.tags }}
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{{ range .Site.Pages }}
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{{ $page := . }}
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{{ $has_common_tags := intersect $tags .Params.tags | len | lt 0 }}
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{{ if and $has_common_tags (ne $page_link $page.Permalink) }}
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<li><a href="{{ $page.Permalink }}">{{ $page.Title }}</a></li>
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{{ end }}
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{{ end }}
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</ul>
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{{< /code >}}
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This is also very useful to use as `AND` filters when combined with where:
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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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