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29 lines
921 B
Markdown
29 lines
921 B
Markdown
---
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title: index
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linktitle: index
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description: Looks up the index(es) or key(s) of the data structure passed into it.
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godocref: https://golang.org/pkg/text/template/#hdr-Functions
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date: 2017-02-01
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publishdate: 2017-02-01
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lastmod: 2017-02-01
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categories: [functions]
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tags: []
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signature:
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workson: []
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hugoversion:
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relatedfuncs: []
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deprecated: false
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aliases: []
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needsexample: true
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---
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`index` looks up the index(es) or key(s) of the data structure passed into it.
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From the godocs:
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> Returns the result of indexing its first argument by the following arguments. Thus "index x 1 2 3" is, in Go syntax, x[1][2][3]. Each indexed item must be a map, slice, or array.
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In Go templates, you can't access array, slice, or map elements directly the same way you would in Go. For example, `$.Site.Data.authors[.Params.authorkey]` isn't supported syntax.
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Instead, you have to use `index`, a function that handles the lookup for you.
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