mirror of
https://github.com/gohugoio/hugo.git
synced 2024-11-07 20:30:36 -05:00
32 lines
1.1 KiB
Markdown
32 lines
1.1 KiB
Markdown
|
---
|
||
|
|
title: "cond"
|
||
|
|
date: 2017-09-08
|
||
|
|
description: "Return one of two arguments, depending on the value of a third argument."
|
||
|
|
categories: [functions]
|
||
|
|
menu:
|
||
|
|
docs:
|
||
|
|
parent: "functions"
|
||
|
|
signature: ["cond CONTROL VAR1 VAR2"]
|
||
|
|
hugoversion: 0.27
|
||
|
|
relatedfuncs: [default]
|
||
|
|
toc: false
|
||
|
|
draft: false
|
||
|
|
needsexamples: false
|
||
|
|
---
|
||
|
|
|
||
|
|
`cond` returns *VAR1* if *CONTROL* is true, or *VAR2* if it is not.
|
||
|
|
|
||
|
|
Example:
|
||
|
|
|
||
|
|
```
|
||
|
|
{{ cond (eq (len $geese) 1) "goose" "geese" }}
|
||
|
|
```
|
||
|
|
|
||
|
|
Would emit "goose" if the `$geese` array has exactly 1 item, or "geese" otherwise.
|
||
|
|
|
||
|
|
{{% warning %}}
|
||
|
|
Whenever you use a `cond` function, *both* variable expressions are *always* evaluated. This means that a usage like `cond false (div 1 0) 27` will throw an error because `div 1 0` will be evaluated *even though the condition is false*.
|
||
|
|
|
||
|
|
In other words, the `cond` function does *not* provide [short-circuit evaluation](https://en.wikipedia.org/wiki/Short-circuit_evaluation) and does *not* work like a normal [ternary operator](https://en.wikipedia.org/wiki/%3F:) that will pass over the first expression if the condition returns `false`.
|
||
|
|
{{% /warning %}}
|