hugo/docs/content/en/functions/collections/Intersect.md

title	description	categories	keywords	action	aliases
collections.Intersect	Returns the common elements of two arrays or slices, in the same order as the first array.			aliases related returnType signatures intersect functions/collections/Complement functions/collections/SymDiff functions/collections/Union any collections.Intersect SET1 SET2	/functions/intersect

A useful example is to use it as AND filters when combined with where:

{{ $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 parameters.

See union for OR.