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| title | linktitle | description | godocref | date | publishdate | lastmod | categories | keywords | signature | workson | hugoversion | relatedfuncs | deprecated | toc | aliases | |||||
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| len | len | Returns the length of a variable according to its type. | https://golang.org/pkg/builtin/#len | 2017-02-01 | 2017-02-01 | 2017-04-18 |
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len is a built-in function in Golang that returns the length of a variable according to its type. From the Golang documentation:
Array: the number of elements in v.
Pointer to array: the number of elements in *v (even if v is nil).
Slice, or map: the number of elements in v; if v is nil, len(v) is zero.
String: the number of bytes in v.
Channel: the number of elements queued (unread) in the channel buffer; if v is nil, len(v) is zero.
len is also considered a fundamental function for Hugo templating.
len Example 1: Longer Headings
You may want to append a class to a heading according to the length of the string therein. The following templating checks to see if the title's length is greater than 80 characters and, if so, adds a long-title class to the <h1>:
{{< code file="check-title-length.html" >}}
{{.Title}} {{< /code >}}len Example 2: Counting Pages with where
The following templating uses where in conjunction with len to figure out the total number of content pages in a posts section:
{{< code file="how-many-posts.html" >}} {{ $posts := (where .Site.RegularPages "Section" "==" "post") }} {{ $postCount := len $posts }} {{< /code >}}
Note the use of .RegularPages, a site variable that counts all regular content pages but not the _index.md pages used to add front matter and content to list templates.