hugo/docs/content/en/functions/isset.md

title	linktitle	description	godocref	date	publishdate	lastmod	categories	menu	keywords	signature	workson	hugoversion	relatedfuncs	deprecated	aliases
isset	isset	Returns true if the parameter is set.		2017-02-01	2017-02-01	2017-02-01	functions	docs parent functions		isset COLLECTION INDEX isset COLLECTION KEY				false

Takes either a slice, array, or channel and an index or a map and a key as input.

{{ if isset .Params "project_url" }} {{ index .Params "project_url" }}{{ end }}

{{% warning %}} All site-level configuration keys are stored as lower case. Therefore, a myParam key-value set in your site configuration file needs to be accessed with {{if isset .Site.Params "myparam"}} and not with {{if isset .Site.Params "myParam"}}. Note that you can still access the same config key with .Site.Params.myParam or .Site.Params.myparam, for example, when using with. This restriction also applies when accessing page-level front matter keys from within shortcodes. {{% /warning %}}