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

title	description	categories	keywords	action	aliases
collections.In	Reports whether the given value is a member of the given set.			aliases related returnType signatures in functions/strings/Contains functions/strings/ContainsAny functions/strings/ContainsNonSpace functions/strings/HasPrefix functions/strings/HasSuffix bool collections.In SET VALUE	/functions/in

The SET can be an array, slice, or string.

{{ $s := slice "a" "b" "c" }}
{{ in $s "b" }} → true

{{ $s := slice 1 2 3 }}
{{ in $s 2 }} → true

{{ $s := slice 1.11 2.22 3.33 }}
{{ in $s 2.22 }} → true

{{ $s := "abc" }}
{{ in $s "b" }} → true