mirror of
https://github.com/gohugoio/hugo.git
synced 2024-11-14 20:37:55 -05:00
e509cac533
cb18a5183 Fix broken link 07a0198bf Config: Place Google Analytics tag ID under the services key 4bf0c719f Fix typo 50d8ad1af Fix muiltilingual menu definition instructions 1a32519a9 Fix typos 6f34ca8e0 Explain usage of front matter to target a template 5bd977257 Improve goldmark config docs 447632938 Remove Docker notes from installation instructions 84741d173 Update reference to hugo.work 0338d7c71 Fix menu template f5d2f5ed4 Fix typos in content/en/functions/fmt a3a40ff99 Add return type to functions 85ac3e779 Remove outdated feature image d47d889e4 Fix signatures 7551ba28f Document safe.JSStr function e77993be0 Document keyVals function 4dba20db3 Update theme babf91544 Update echoparam 8c8203efa Adjust related functions 4cb1b30fc Fix example ba95eca64 Improve showcase prose 5d3dcf366 Add Overmind Studios showcase 8d634ac70 Change code blocks from indented to fenced cfab978e6 Add missing code fences 407dd5c47 Limit related pages for functions to other functions 9fa67d981 Fix .Site.LastChange doc 393aa16d0 netlify: Hugo 0.119.0 f864af97a docs: Even more about images.Process 9d772d5f0 docs: More about images.Process bc655f869 docs: Regen docshelper 41c3536d1 Merge commit '9aec42c5452b3eb224888c50ba1c3f3b68a447e9' 918ed53f4 Add images.Process filter 573645883 Add $image.Process a1151b0fd Add images.Opacity filter git-subtree-dir: docs git-subtree-split: cb18a5183fc62f301ffde50b8c39f03e4b897aec
88 lines
2.1 KiB
Markdown
88 lines
2.1 KiB
Markdown
---
|
|
title: compare.Default
|
|
linkTitle: default
|
|
description: Allows setting a default value that can be returned if a first value is not set.
|
|
categories: [functions]
|
|
keywords: []
|
|
menu:
|
|
docs:
|
|
parent: functions
|
|
function:
|
|
aliases: [default]
|
|
returnType: any
|
|
signatures: [compare.Default DEFAULT INPUT]
|
|
relatedFunctions:
|
|
- compare.Conditional
|
|
- compare.Default
|
|
aliases: [/functions/default]
|
|
---
|
|
|
|
`default` checks whether a given value is set and returns a default value if it is not. *Set* in this context means different things depending on the data type:
|
|
|
|
* non-zero for numeric types and times
|
|
* non-zero length for strings, arrays, slices, and maps
|
|
* any boolean or struct value
|
|
* non-nil for any other types
|
|
|
|
`default` function examples reference the following content page:
|
|
|
|
{{< code file="content/posts/default-function-example.md" >}}
|
|
---
|
|
title: Sane Defaults
|
|
seo_title:
|
|
date: 2017-02-18
|
|
font:
|
|
oldparam: The default function helps make your templating DRYer.
|
|
newparam:
|
|
---
|
|
{{< /code >}}
|
|
|
|
`default` can be written in more than one way:
|
|
|
|
```go-html-template
|
|
{{ .Params.font | default "Roboto" }}
|
|
{{ default "Roboto" .Params.font }}
|
|
```
|
|
|
|
Both of the above `default` function calls return `Roboto`.
|
|
|
|
A `default` value, however, does not need to be hard coded like the previous example. The `default` value can be a variable or pulled directly from the front matter using dot notation:
|
|
|
|
```go-html-template
|
|
{{ $old := .Params.oldparam }}
|
|
<p>{{ .Params.newparam | default $old }}</p>
|
|
```
|
|
|
|
Which would return:
|
|
|
|
```html
|
|
<p>The default function helps make your templating DRYer.</p>
|
|
```
|
|
|
|
And then using dot notation
|
|
|
|
```go-html-template
|
|
<title>{{ .Params.seo_title | default .Title }}</title>
|
|
```
|
|
|
|
Which would return
|
|
|
|
```html
|
|
<title>Sane Defaults</title>
|
|
```
|
|
|
|
The following have equivalent return values but are far less terse. This demonstrates the utility of `default`:
|
|
|
|
Using `if`:
|
|
|
|
```go-html-template
|
|
<title>{{ if .Params.seo_title }}{{ .Params.seo_title }}{{ else }}{{ .Title }}{{ end }}</title>
|
|
=> Sane Defaults
|
|
```
|
|
|
|
Using `with`:
|
|
|
|
```go-html-template
|
|
<title>{{ with .Params.seo_title }}{{ . }}{{ else }}{{ .Title }}{{ end }}</title>
|
|
=> Sane Defaults
|
|
```
|