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22 lines
1,018 B
Markdown
22 lines
1,018 B
Markdown
---
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title: isset
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description: Returns true if the parameter is set.
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categories: [functions]
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menu:
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docs:
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parent: functions
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keywords: []
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signature: ["isset COLLECTION INDEX", "isset COLLECTION KEY"]
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relatedfuncs: []
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---
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Takes either a slice, array, or channel and an index or a map and a key as input.
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```go-html-template
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{{ if isset .Params "project_url" }} {{ index .Params "project_url" }}{{ end }}
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```
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{{% note %}}
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All site-level configuration keys are stored as lower case. Therefore, a `myParam` key-value set in your [site configuration file](/getting-started/configuration/) 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`](/functions/with).
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This restriction also applies when accessing page-level front matter keys from within [shortcodes](/content-management/shortcodes/).
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{{% /note %}}
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