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Merge commit 'b9bd35d72e14932fb6588ff62b90cddef0a060fc' as 'docs'

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Bjørn Erik Pedersen
2019-10-21 10:22:28 +02:00
parent 39121de4d9 b9bd35d72e
commit 27aef3f1fb
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---
title: "complement"
description: "`collections.Complement` (alias `complement`) gives the elements of a collection that are not in any of the others."
date: 2018-11-07
categories: [functions]
menu:
docs:
parent: "functions"
keywords: [collections,intersect,union]
signature: ["COLLECTION | complement COLLECTION [COLLECTION]..." ]
hugoversion: "0.51"
aliases: []
---
Example:
```go-html-template
{{ $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.