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hugo/content/en/functions/complement.md
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title description date categories menu keywords signature hugoversion aliases
complement `collections.Complement` (alias `complement`) gives the elements of a collection that are not in any of the others. 2018-11-07
functions
docs
parent
functions
collections
intersect
union
COLLECTION | complement COLLECTION [COLLECTION]...
0.51

Example:

{{ $pages := site.RegularPages | first 50 }}
{{ $news := where $pages "Type" "news" | first 5 }}
{{ $blog := where $pages "Type" "blog" | first 5 }}
{{ $other := $pages | complement $news $blog | first 10 }}

The above is an imaginary use case for the home page where you want to display different page listings in sections/boxes on different places on the page: 5 from news, 5 from the blog and then 10 of the pages not shown in the other listings, to complement them.