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101 lines
2.3 KiB
Markdown
101 lines
2.3 KiB
Markdown
---
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title: collections.Append
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description: Appends one or more elements to a slice and returns the resulting slice.
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categories: []
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keywords: []
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action:
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aliases: [append]
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related:
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- functions/collections/Merge
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returnType: any
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signatures:
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- collections.Append ELEMENT [ELEMENT...] COLLECTION
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- collections.Append COLLECTION1 COLLECTION2
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aliases: [/functions/append]
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---
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This function appends all elements, excluding the last, to the last element. This allows [pipe](/getting-started/glossary/#pipeline) constructs as shown below.
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Append a single element to a slice:
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```go-html-template
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{{ $s := slice "a" "b" }}
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{{ $s }} → [a b]
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{{ $s = $s | append "c" }}
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{{ $s }} → [a b c]
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```
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Append two elements to a slice:
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```go-html-template
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{{ $s := slice "a" "b" }}
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{{ $s }} → [a b]
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{{ $s = $s | append "c" "d" }}
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{{ $s }} → [a b c d]
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```
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Append two elements, as a slice, to a slice. This produces the same result as the previous example:
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```go-html-template
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{{ $s := slice "a" "b" }}
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{{ $s }} → [a b]
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{{ $s = $s | append (slice "c" "d") }}
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{{ $s }} → [a b c d]
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```
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Start with an empty slice:
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```go-html-template
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{{ $s := slice }}
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{{ $s }} → []
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{{ $s = $s | append "a" }}
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{{ $s }} → [a]
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{{ $s = $s | append "b" "c" }}
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{{ $s }} → [a b c]
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{{ $s = $s | append (slice "d" "e") }}
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{{ $s }} → [a b c d e]
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```
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If you start with a slice of a slice:
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```go-html-template
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{{ $s := slice (slice "a" "b") }}
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{{ $s }} → [[a b]]
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{{ $s = $s | append (slice "c" "d") }}
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{{ $s }} → [[a b] [c d]]
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```
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To create a slice of slices, starting with an empty slice:
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```go-html-template
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{{ $s := slice }}
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{{ $s }} → []
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{{ $s = $s | append (slice (slice "a" "b")) }}
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{{ $s }} → [[a b]]
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{{ $s = $s | append (slice "c" "d") }}
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{{ $s }} → [[a b] [c d]]
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```
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Although the elements in the examples above are strings, you can use the `append` function with any data type, including Pages. For example, on the home page of a corporate site, to display links to the two most recent press releases followed by links to the four most recent articles:
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```go-html-template
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{{ $p := where site.RegularPages "Type" "press-releases" | first 2 }}
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{{ $p = $p | append (where site.RegularPages "Type" "articles" | first 4) }}
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{{ with $p }}
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<ul>
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{{ range . }}
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<li><a href="{{ .RelPermalink }}">{{ .LinkTitle }}</a></li>
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{{ end }}
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</ul>
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{{ end }}
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```
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