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200 lines
3.9 KiB
Markdown
200 lines
3.9 KiB
Markdown
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---
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title: range
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description: Iterates over a non-empty collection, binds context (the dot) to successive elements, and executes the block.
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categories: []
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keywords: []
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action:
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aliases: []
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related:
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- functions/go-template/break
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- functions/go-template/continue
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- functions/go-template/else
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- functions/go-template/end
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returnType:
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signatures: [range COLLECTION]
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aliases: [/functions/range]
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toc: true
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---
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{{% include "functions/go-template/_common/truthy-falsy.md" %}}
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```go-html-template
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{{ $s := slice "foo" "bar" "baz" }}
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{{ range $s }}
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{{ . }} → foo bar baz
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{{ end }}
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```
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Use with the [`else`] statement:
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```go-html-template
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{{ $s := slice "foo" "bar" "baz" }}
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{{ range $s }}
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<p>{{ . }}</p>
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{{ else }}
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<p>The collection is empty</p>
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{{ end }}
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```
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Within a range block:
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- Use the [`continue`] statement to stop the innermost iteration and continue to the next iteration
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- Use the [`break`] statement to stop the innermost iteration and bypass all remaining iterations
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## Understanding context
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At the top of a page template, the [context] (the dot) is a `Page` object. Within the `range` block, the context is bound to each successive element.
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With this contrived example that uses the [`seq`] function to generate a slice of integers:
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```go-html-template
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{{ range seq 3 }}
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{{ .Title }}
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{{ end }}
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```
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Hugo will throw an error:
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can't evaluate field Title in type int
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The error occurs because we are trying to use the `.Title` method on an integer instead of a `Page` object. Within the `range` block, if we want to render the page title, we need to get the context passed into the template.
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{{% note %}}
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Use the `$` to get the context passed into the template.
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{{% /note %}}
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This template will render the page title three times:
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```go-html-template
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{{ range seq 3 }}
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{{ $.Title }}
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{{ end }}
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```
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{{% note %}}
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Gaining a thorough understanding of context is critical for anyone writing template code.
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{{% /note %}}
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[`seq`]: functions/collections/seq/
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[context]: /getting-started/glossary/#context
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## Array or slice of scalars
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This template code:
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```go-html-template
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{{ $s := slice "foo" "bar" "baz" }}
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{{ range $s }}
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<p>{{ . }}</p>
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{{ end }}
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```
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Is rendered to:
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```html
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<p>foo</p>
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<p>bar</p>
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<p>baz</p>
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```
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This template code:
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```go-html-template
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{{ $s := slice "foo" "bar" "baz" }}
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{{ range $v := $s }}
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<p>{{ $v }}</p>
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{{ end }}
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```
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Is rendered to:
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```html
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<p>foo</p>
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<p>bar</p>
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<p>baz</p>
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```
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This template code:
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```go-html-template
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{{ $s := slice "foo" "bar" "baz" }}
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{{ range $k, $v := $s }}
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<p>{{ $k }}: {{ $v }}</p>
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{{ end }}
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```
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Is rendered to:
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```html
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<p>0: foo</p>
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<p>1: bar</p>
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<p>2: baz</p>
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```
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## Array or slice of maps
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This template code:
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```go-html-template
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{{ $m := slice
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(dict "name" "John" "age" 30)
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(dict "name" "Will" "age" 28)
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(dict "name" "Joey" "age" 24)
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}}
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{{ range $m }}
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<p>{{ .name }} is {{ .age }}</p>
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{{ end }}
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```
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Is rendered to:
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```html
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<p>John is 30</p>
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<p>Will is 28</p>
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<p>Joey is 24</p>
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```
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## Array or slice of pages
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This template code:
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```go-html-template
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{{ range where site.RegularPages "Type" "articles" }}
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<h2><a href="{{ .RelPermalink }}">{{ .LinkTitle }}</a></h2>
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{{ end }}
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```
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Is rendered to:
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```html
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<h2><a href="/articles/article-3/">Article 3</a></h2>
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<h2><a href="/articles/article-2/">Article 2</a></h2>
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<h2><a href="/articles/article-1/">Article 1</a></h2>
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```
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## Maps
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This template code:
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```go-html-template
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{{ $m := dict "name" "John" "age" 30 }}
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{{ range $k, $v := $m }}
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<p>key = {{ $k }} value = {{ $v }}</p>
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{{ end }}
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```
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Is rendered to:
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```go-html-template
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<p>key = age value = 30</p>
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<p>key = name value = John</p>
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```
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Unlike ranging over an array or slice, Hugo sorts by key when ranging over a map.
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{{% include "functions/go-template/_common/text-template.md" %}}
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[`else`]: /functions/go-template/else
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[`break`]: /functions/go-template/break
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[`continue`]: /functions/go-template/continue
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