collections.Complement

若要找出 $c3 中不存在於 $c1 或 $c2 的元素：

{{ $c1 := slice 3 }}
{{ $c2 := slice 4 5 }}
{{ $c3 := slice 1 2 3 4 5 }}

{{ complement $c1 $c2 $c3 }} → [1 2]

{{ $c3 | complement $c1 $c2 }} → [1 2]

您也可以將 complement 函數應用於頁面集合。假設您的網站有五種內容類型：

content/
├── blog/
├── books/
├── faqs/
├── films/
└── songs/

若要列出除了 blog 和 faqs 之外的所有內容：

{{ $blog := where site.RegularPages "Type" "blog" }}
{{ $faqs := where site.RegularPages "Type" "faqs" }}
{{ range site.RegularPages | complement $blog $faqs }}
  <a href="{{ .RelPermalink }}">{{ .LinkTitle }}</a>
{{ end }}

{{ range where site.RegularPages "Type" "not in" (slice "blog" "faqs") }}
  <a href="{{ .RelPermalink }}">{{ .LinkTitle }}</a>
{{ end }}

在以下範例中，我們使用 complement 函數移除句子中的停用字：

{{ $text := "The quick brown fox jumps over the lazy dog" }}
{{ $stopWords := slice "a" "an" "in" "over" "the" "under" }}
{{ $filtered := split $text " " | complement $stopWords }}

{{ delimit $filtered " " }} → The quick brown fox jumps lazy dog
collections.Delimit collections.Apply