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44 lines
1.3 KiB
Markdown
44 lines
1.3 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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tags: []
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ns:
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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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Given two arrays (or slices), `intersect` returns the common elements. 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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```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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```
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{{% /code %}}
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[partials]: /templates/partials/
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[single]: /templates/single-page-templates/
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